Ever Power Engineering · Sprocket Solutions for the UK Market
Motorcycle Chain Drive Sprockets for High-Performance Transmission Systems
Precision-engineered sprocket wheels built for British OEM manufacturers, specialist workshops, and performance aftermarket suppliers across England, Scotland, Wales, and Northern Ireland
18+ Years Engineering Experience
Custom Tooth Profiles Available
Motorcycle chain drive systems are the backbone of power transmission in virtually every two-wheeled machine built for the road or track. From the morning commuter threading through London traffic on a 125cc learner bike to the high-displacement adventure tourer descending the A9 into the Scottish Highlands, the fundamental mechanism remains the same: a precision drive sprocket mounted to the engine output shaft meshes with a roller chain, which in turn drives the rear wheel sprocket, converting engine torque into forward motion with unmatched mechanical efficiency. Within this deceptively simple arrangement, the motorcycle chain sprocket is arguably the most mechanically critical component — its tooth geometry, material grade, pitch accuracy, and surface hardness collectively determine how efficiently power is transferred, how smoothly the chain engages under load, and how long the entire drivetrain survives the demands of real-world riding in British conditions.
For UK-based OEM motorcycle manufacturers, independent workshops, and aftermarket component distributors, the choice of sprocket supplier carries significant commercial and technical weight. A poorly specified motorcycle chain sprocket creates chain vibration, accelerates wear across the entire drivetrain, increases maintenance intervals, and ultimately damages the reputation of every product it sits within. Conversely, a correctly engineered sprocket — one manufactured to precise pitch tolerances, hardened to the appropriate Rockwell scale, and finished with an effective anti-corrosion treatment suited to British road conditions — can extend chain life by 30 to 50 percent, reduce drivetrain noise to near-silent levels, and dramatically improve the consistency of power delivery throughout the RPM range.
Ever Power has been engineering and manufacturing sprocket systems for over 18 years, supplying both standard catalogue products and fully bespoke solutions to OEM customers, distributors, and performance builders across England, Scotland, Wales, and Northern Ireland. Every motorcycle chain sprocket that leaves our facility has undergone pitch circle diameter verification, tooth profile inspection, and surface hardness testing before dispatch — giving UK buyers the documented confidence they need to approve a new component supplier and keep it approved across production cycles.
✉ Get a Quote — Contact Ever PowerThe Engineering Principles Behind Motorcycle Chain Drive Sprockets
A motorcycle chain sprocket operates on the principle of positive engagement drive — unlike friction-based belt or gear systems, the roller chain locks physically into each tooth, ensuring zero slip under high-torque loads. The drive sprocket (commonly called the countershaft or front sprocket) carries fewer teeth, rotating at engine output shaft speed and stepping torque up through the chain to the larger driven sprocket bolted to the rear wheel hub. The ratio between front and rear tooth counts defines the overall final drive ratio, which engineers tune to balance low-speed torque multiplication with high-speed power delivery according to the motorcycle’s intended application and market segment.
Tooth profile geometry is specified according to ISO 606 and ANSI B29.1 standards, with the involute form controlling the rate at which each chain roller seats onto and lifts from the tooth flank. A correctly profiled tooth distributes contact load across multiple links simultaneously, preventing the stress concentration that causes premature tooth tip erosion and chain link plate fatigue. Ever Power’s CNC hobbing and profile milling processes maintain tooth pitch tolerances to within ±0.05 mm — a critical parameter for smooth power delivery in high-RPM applications such as sports bikes, club racers, and performance-tuned commuters.
Chain pitch — the centre-to-centre distance between roller pins — is the fundamental compatibility parameter. The most common pitches in motorcycle applications are 420, 428, 520, 525, and 530, where the numerical designation encodes both pitch (in eighths of an inch) and roller width. Selecting the correct pitch class for a given power output is essential: undersized pitch chains and sprockets in high-torque applications accelerate fatigue failure and reduce chain service life significantly, while oversized components add unnecessary rotating mass and may not package within the swingarm clearance envelope of many modern motorcycle designs.
Technical Specifications & Performance Parameters
| Parameter | Drive Sprocket (Front) | Driven Sprocket (Rear) | Reference Standard |
|---|---|---|---|
| Available Chain Pitch | 420 / 428 / 520 / 525 / 530 | 420 / 428 / 520 / 525 / 530 | ISO 606 / ANSI B29.1 |
| Tooth Count Range | 12 – 21 teeth | 28 – 62 teeth | Custom available |
| Primary Material | C45 / 42CrMo4 alloy steel | C45 steel / 7075-T6 aluminium | EN ISO 683-1 |
| Surface Hardness | HRC 48 – 58 (induction hardened) | HRC 45 – 55 / HB 160 (alu) | Verified per batch |
| Bore Fit Tolerance | H7 / H8 fit | H7 fit or splined hub | ISO 286-1 |
| Pitch Circle Tolerance | ±0.05 mm | ±0.05 mm | CNC hobbing verified |
| Surface Treatment Options | Black oxide / phosphate / zinc | Hard anodise (alu) / zinc coat | RoHS compliant |
| Max Continuous Power | Up to 220 kW (steel, 530 pitch) | Application dependent | Consult for race spec |
| Minimum Order Quantity | 50 pcs standard; 1 pc prototype | 50 pcs standard; 1 pc prototype | Volume pricing available |
Material Selection and Manufacturing Process
The material specification of a motorcycle chain sprocket is the engineering foundation upon which all performance characteristics are built — it cannot be treated as a secondary purchasing decision. For drive sprockets subjected to the highest rotational speeds and the greatest contact stresses, Ever Power specifies 42CrMo4 chromium-molybdenum alloy steel as its premium grade. This medium-carbon low-alloy material delivers an outstanding combination of tensile strength, toughness, and response to heat treatment, making it the preferred choice for high-torque, high-RPM applications encountered on sports bikes, loaded touring machines, and any motorcycle where drivetrain longevity under sustained load is a design requirement. Following rough machining, components undergo induction hardening — a process that rapidly heats only the tooth surface layer to austenising temperature before quenching — creating a hardened case of HRC 48–58 while preserving a tough, ductile core that absorbs shock loading without brittle fracture.
Rear driven sprockets, particularly those for performance and racing applications across the UK’s circuit and club racing calendar, are frequently specified in 7075-T6 aerospace-grade aluminium alloy. At roughly one-third the density of steel, aluminium sprockets dramatically reduce unsprung and rotating mass — a measurable benefit in high-frequency oscillation damping and throttle response sharpness. The trade-off is moderately reduced tooth life compared to steel, which is why aluminium rear sprockets are paired with a steel drive sprocket and treated as a managed wear item. Hard anodising adds a dense aluminium oxide surface layer of 40–60 microns that significantly improves wear resistance and provides corrosion protection appropriate for UK road and track conditions, including the salt spray and winter wet exposure that is unavoidable on British roads between October and March.
Our manufacturing sequence begins with precision bar stock or forged blanks verified to material certificates, followed by CNC turning of hub and bore geometry, CNC hobbing or profile milling of the tooth form, keyway and spline broaching where required, heat treatment, post-hardening straightness verification, and final surface treatment. Every stage is documented under our quality management system, and batch traceability is maintained through to dispatch. For UK customers requiring specific documentation — including material certificates to BS EN 10204 3.1, CMM dimensional inspection reports, hardness test records, or PPAP packages — these are available as standard options from the quotation stage, ensuring compatibility with UK OEM supplier approval processes.
Application Scenarios Across the UK Motorcycle Sector
Motorcycle chain drive sprockets serve an exceptionally diverse range of applications, and each segment of the UK two-wheeled market places distinct demands on the same fundamental component. Understanding these demands in engineering detail is what separates a correctly specified sprocket from one that fails in service — and allows procurement teams to make informed sourcing decisions from the outset.
🚘 Road Motorcycles and Daily Commuter Bikes
The UK’s urban commuter fleet — spanning the vast number of 125cc to 650cc machines registered across London, Birmingham, Manchester, Leeds, and Bristol — represents the largest volume segment for standard motorcycle chain sprockets. These machines demand sprockets that balance longevity with low maintenance overhead across typical UK annual mileages of 8,000 to 15,000 miles. The priority specification parameters are bore accuracy for straightforward fitting, consistent pitch circle diameter for compatibility with sealed O-ring or X-ring chains, and adequate surface hardness to withstand prolonged low-to-medium load cycling through urban stop-start traffic. Ever Power’s C45 steel sprockets with zinc phosphate or black oxide treatment are the standard recommendation for this application, offering a reliable service life that typically spans two or more chain replacement intervals before the sprocket itself requires attention.
🏋 Track Racing and British Superbike Support Classes
British club racing, the BSB paddock, and the trackday community at circuits including Cadwell Park, Donington, Brands Hatch, and Oulton Park represent a technically uncompromising segment where sprocket performance directly influences lap time and mechanical reliability under extreme conditions. A 1000cc superbike may apply over 150 kW through a 530-pitch chain system at sustained high RPM across a full race distance, with the drive sprocket experiencing thousands of tooth engagements per minute under peak loading. These applications demand 42CrMo4 drive sprockets with induction-hardened teeth and 7075-T6 aluminium rear sprockets — the combination minimising drivetrain inertia while maintaining sufficient tooth life across a full race weekend. Many BSB-class teams specify 520-pitch conversion kits specifically to reduce drivetrain rotating mass, a modification that Ever Power supports with matching sprocket sets in all common tooth count configurations.
🏟 Adventure Touring, Enduro, and Off-Road Machines
Adventure touring motorcycles and enduro machines impose a completely different loading regime on chain drive sprockets: irregular terrain, high shock loads during jumps and rough trail sections, sustained low-speed high-torque operation on steep gradients, and constant exposure to mud, water, and abrasive grit. In the UK’s Peak District, Brecon Beacons, Trossachs, and Lake District riding environments, sprockets may be exposed to Scottish peat, Welsh hill-farm mud, limestone grit, and the wet clay soils of English green-lane trails — all of which accelerate surface abrasion and promote corrosion between rides. For these demanding conditions, Ever Power recommends heavy-duty C45 steel or 42CrMo4 sprockets with wide-tooth profiles sized to accommodate thicker O-ring chains, combined with maximum surface hardness values and robust phosphate treatment for enhanced rust resistance during extended outdoor storage between riding seasons.
🏗 OEM Production Lines and UK Aftermarket Distributors
UK motorcycle manufacturers, importers, and aftermarket component distributors require sprocket suppliers capable of meeting production schedule demands, delivering consistent part-to-part dimensional repeatability, and providing full documentation compatible with ISO 9001 quality management systems. Ever Power’s production capability supports weekly or monthly scheduled deliveries with batch consistency verified by coordinate measuring machine reports, allowing UK assembly operations to implement incoming inspection-free acceptance protocols based on agreed quality control plans. Our aftermarket supply capability also supports UK distributors with branded and private-label packaging options, covering the replacement parts market across commuter, touring, sports, and off-road segments. For distributors managing stock of multiple pitch and tooth count combinations, Ever Power offers consolidated monthly shipments with comprehensive packing lists and batch documentation to streamline receiving and warehousing operations.
⚡ Electric Motorcycle Conversions and EV Build Specialists
The UK’s growing electric motorcycle sector — including EV conversion kit suppliers, bespoke zero-emission bike builders, and university engineering projects — presents a rapidly expanding demand for non-standard motorcycle chain sprockets. Electric motors produce maximum torque from zero RPM, meaning the drive sprocket sees peak load precisely at standstill during launches — the most severe condition for tooth deformation in underspecified components. Ever Power works with UK EV conversion specialists to engineer custom drive sprockets compatible with brushless motor output shaft dimensions, frequently requiring non-standard bore profiles, custom keyway configurations, and elevated surface hardness specifications to manage the distinctive loading characteristics of electric drivetrain systems. Hub adaptor designs are also available, allowing standard sprocket assemblies to mate with non-standard motor shafts at lower per-unit cost for higher-volume conversion programmes.
Why UK Engineers Choose Ever Power Motorcycle Chain Sprockets
Every tooth profile is cut and continuously verified during CNC hobbing with automatic in-process measurement, guaranteeing pitch circle consistency across entire production batches. This eliminates the cumulative pitch error that causes chain vibration, premature link wear, and noise — quality issues that erode customer confidence in the products sprockets are installed within.
Selective induction hardening of tooth flanks and tips achieves HRC 48–58 surface hardness while maintaining a tough core. This delivers the ideal balance of wear resistance and impact toughness that sustained high-mileage UK road use demands, particularly on the drive sprocket which sees the highest contact stress per tooth in any given drivetrain.
Our motorcycle chain sprockets are manufactured and documented to BS EN ISO 606 chain wheel standards, with full material certification to BS EN 10204 3.1 available on request. This meets the documentation requirements of UK OEM quality management systems and gives procurement engineers the traceability records their supplier approval processes require.
Non-standard tooth counts, custom bore profiles, bespoke hub configurations, multi-row formats, and special surface treatments are all within our engineering scope. From DXF drawings through to reverse-engineered replacements from physical samples, our team can manufacture any motorcycle chain sprocket specification a UK project demands — without the minimum quantity barriers that block many custom sourcing requests.
Standard catalogue motorcycle chain sprockets ship within 3–7 working days via documented freight routes, with DDP (Delivered Duty Paid) pricing available for UK customers. DDP pricing eliminates import complexity, provides total landed cost transparency from the quotation stage, and removes the duty classification uncertainties that can complicate post-Brexit procurement for UK engineering buyers.
Our pricing structure scales efficiently from single prototype pieces through to high-volume OEM production runs — giving UK businesses the flexibility to develop and validate new designs without prohibitive minimum quantity requirements. Volume pricing tiers are applied transparently at the quotation stage, allowing buyers to plan procurement budgets accurately across programme phases.
Customer Success: British Racing Prepared Vehicles Ltd, Coventry
Background: British Racing Prepared Vehicles Ltd (BRPV) is a Coventry-based specialist in building and supplying race-prepared motorcycle platforms for BSB support classes and private trackday clients. Managing a fleet of approximately 40 race machines across multiple engine classes, BRPV’s engineers had been experiencing premature rear sprocket wear — specifically, tooth tip erosion within 8–10 hours of track use — with their previous supplier’s aluminium sprockets. This was causing unacceptable chain noise, increasing maintenance overhead between race weekends, and contributing to occasional mid-session drivetrain anomalies that led to precautionary machine withdrawals during competitive events.
Solution: BRPV’s head engineer contacted Ever Power with a detailed specification request for 520-pitch aluminium rear sprockets in 40, 42, and 45-tooth configurations, requesting a hard anodise finish of 40–60 microns and a tighter-than-catalogue pitch circle tolerance of ±0.03 mm for their highest-precision applications. Ever Power’s engineering team reviewed the existing tooth profile drawings and proposed a modified flank radius geometry that improves chain seating behaviour under high-shock loading, alongside a change from standard 7075-T6 to the 7075-T73 temper variant, which offers superior stress corrosion resistance in environments involving cleaning chemicals and occasional moisture ingress.
Result: Sprocket service life increased from an average of 8–10 hours to 22–28 hours of track use — a 175 percent improvement. Chain noise at the rear sprocket was eliminated within the first test session. BRPV now sources all final drive sprockets exclusively through Ever Power and has expanded the relationship to include custom countershaft sprockets for three new platform builds. The partnership has reduced BRPV’s per-race drivetrain maintenance cost by an estimated 38 percent compared to their previous supply arrangement.
What UK Clients Say About Ever Power Sprockets
“We’ve tested motorcycle chain sprockets from four different suppliers over three years. Ever Power’s 530-pitch steel drive sprockets have outlasted every alternative by a significant margin. The dimensional consistency across batches means our fitting technicians can work faster with no surprises at the vice. For a high-volume workshop, that reliability is worth considerably more than the price difference.”
James Thornton, Technical Director
Thornton Motorcycle Engineering, Birmingham, West Midlands
★★★★★
“We needed a custom 428-pitch drive sprocket for a vintage class restoration with a specific bore and keyway combination that no catalogue supplier could match. Ever Power turned around a prototype from our 2D drawing in under two weeks, and the part fitted perfectly on the first attempt. Their engineering communication throughout was clear and professional — exactly what you need when you’re working to a race calendar deadline.”
Sarah McAllister, Workshop Manager
Classic Iron Restoration, Edinburgh, Scotland
★★★★★
“As a distributor supplying the UK motorcycle aftermarket, our reputation depends entirely on the quality of the components we stock. Since switching to Ever Power for our 520 and 530 sprocket range, our customer return rate for sprocket-related issues has dropped to essentially zero. The black oxide finish holds up in UK winter conditions far better than the zinc plating we received from our previous supplier. Highly recommended for any B2B procurement team in this market.”
Derek Walsh, Procurement Manager
TwoWheels Distribution Ltd, Manchester, Greater Manchester
★★★★★
Ever Power Manufacturing Facility & Custom Sprocket Engineering
Ever Power operates a purpose-built manufacturing facility equipped with multi-axis CNC turning and machining centres, precision gear hobbing machines, CNC profile milling systems, a dedicated heat treatment cell incorporating induction hardening and carburising furnaces, and a fully instrumented quality control laboratory. Our production capacity supports continuous output of motorcycle chain sprockets ranging from small-bore moped and learner-bike sprockets through to large-diameter assembly wheel configurations used in specialist vehicle and industrial applications, maintaining consistent quality across batch sizes from individual prototype pieces to tens of thousands of production units per month.
The custom sprocket engineering service is one of Ever Power’s most strategically important capabilities for UK motorcycle sector clients — and it is an area where we invest heavily in both tooling and engineering personnel. For UK motorcycle manufacturers, EV conversion specialists, and racing organisations that cannot source their required specification from any standard catalogue, our team provides a complete design-to-production service. This covers reverse engineering from physical samples or worn originals, CAD modelling with DXF and STEP file generation, material selection consultation, prototype manufacturing with full dimensional inspection reports, customer approval sign-off, and smooth transition to full production with locked process parameters. Custom tooling costs are kept competitive through our in-house toolroom, which manufactures special-profile hobs and form tools without dependence on external tooling suppliers — a capability that gives our UK customers faster tooling lead times and significantly lower NRE (non-recurring engineering) charges on first-off custom designs.
UK customers benefit from DDP pricing that is fully inclusive of customs duties and UK-destination delivery charges, eliminating import complexity and giving total landed cost transparency from the initial quotation. Our logistics team maintains established freight routes with documented transit times to all major UK delivery addresses, and consolidated shipments for customers ordering multiple product lines simultaneously are a standard service option — reducing freight cost per part for businesses managing diverse sprocket portfolios across multiple motorcycle applications.
Supplying the UK Motorcycle Industry: From London to Edinburgh
The United Kingdom has a long and distinguished heritage in motorcycle engineering, from the mid-century golden era of British marques through to the thriving contemporary landscape of independent builders, specialist workshops, and internationally competitive racing teams. Today, the UK motorcycle industry encompasses OEM assembly and import operations, a large and commercially active aftermarket, over 1.3 million registered motorcycles on UK roads, and a year-round calendar of club and national racing events that demands a technically competent and reliable sprocket supply chain operating throughout all seasons.
Ever Power’s supply relationship with UK customers spans motorcycle workshops in London, Birmingham, Manchester, and Bristol; racing preparation specialists in the East Midlands engineering corridor; adventure and off-road specialist retailers serving the Welsh Borders, Lake District, and Scottish Highlands riding communities; and aftermarket distributors operating from logistics centres in Northampton, Leeds, and Glasgow. This geographic coverage, combined with our ability to respond efficiently to both standard repeat orders and urgent custom requirements, positions Ever Power as a genuinely useful long-term partner for any UK business operating in the motorcycle sector.
The UK’s adoption of stricter DVSA inspection criteria for drivetrain condition, combined with growing rider interest in properly maintained motorcycles for insurance and resale value purposes, has created sustained demand for correctly specified replacement motorcycle chain sprockets — not simply low-cost alternatives that meet minimum visual appearance standards. Ever Power’s product range is positioned firmly in the quality-assured segment of this replacement market, providing UK buyers with the documentation, dimensional consistency, and corrosion resistance performance that purely cost-competitive alternatives cannot reliably deliver across the British riding year.
Frequently Asked Questions
Where can I find a reliable UK motorcycle chain sprocket supplier that offers custom tooth count options and fast delivery to England or Scotland?
Ever Power supplies custom and standard motorcycle chain sprockets to UK customers with DDP delivery covering England, Scotland, Wales, and Northern Ireland. Standard catalogue orders typically ship within 3–7 working days. Custom prototype sprockets are generally ready within 10–15 working days of drawing approval. Email your specification to [email protected] and we will provide a price and lead time within 24 hours on UK working days.
What is the best material for a motorcycle chain drive sprocket used on a UK road bike that needs to survive wet winters and road salt from October to March?
For UK road conditions including prolonged wet weather and road salt exposure, we recommend C45 steel sprockets with zinc phosphate or black oxide surface treatment. These resist corrosion far more effectively than bare zinc plating once scratched. For the highest mileage commuters or touring bikes covering 15,000+ miles annually, 42CrMo4 alloy steel with an induction-hardened tooth surface and black oxide finish is the optimal specification for UK year-round use.
How do I calculate the correct gear ratio when changing motorcycle chain sprocket tooth counts to improve acceleration or increase top speed on a UK road or track bike?
The final drive ratio equals rear sprocket teeth divided by front sprocket teeth. Increasing the rear tooth count (or reducing the front) raises the ratio — improving acceleration but reducing top speed. Reducing the rear count lowers the ratio — improving top speed but reducing low-speed torque. As a practical guide, adding one tooth to the rear sprocket reduces maximum speed by approximately 2–3 percent while improving acceleration by a similar margin. Contact Ever Power’s technical team for a full gearing consultation specific to your motorcycle model and application.
What is the typical price or cost of a custom motorcycle chain sprocket from a B2B supplier in the UK, and what factors affect the quote?
Pricing varies significantly based on chain pitch, tooth count, material grade, surface treatment, bore configuration, and order quantity. Standard steel sprockets in common pitches (520/530) at moderate production quantities typically price between £8 and £25 per piece depending on size and finish. Custom specifications carry additional engineering and tooling charges. Aluminium racing sprockets in small quantities typically range from £15 to £45 per piece. For an accurate price based on your exact specification, email your drawing or dimensions to [email protected] for a formal quotation within 24 working hours.
Which chain pitch should I specify when sourcing motorcycle chain sprockets for a British Superbike-class racing machine competing in UK club or national events?
Most production-based superbikes in BSB and UK national racing use 520 or 530 pitch chain systems. 530 pitch is standard on many factory-specification machines due to its higher load rating. Many race teams convert to 520 pitch to reduce rotating and unsprung mass — a narrower, lighter system that handles race-tuned power outputs while saving 200–400 g of drivetrain mass. Ever Power supplies both pitches in racing grades with tight-tolerance pitch circle specifications. We recommend discussing your specific machine’s power output and regulations compliance requirements before committing to a pitch conversion.
How long does a motorcycle chain sprocket typically last on a UK commuter bike, and when should a workshop or owner plan to replace it?
On a well-maintained UK commuter motorcycle with regular chain lubrication and correct tension, a quality steel drive sprocket should last 20,000–40,000 miles, often outlasting two or three chains. The rear sprocket typically wears faster due to its larger diameter. Replace when teeth appear hooked or shark-fin shaped, when visible metal has been removed from the flanks, or when the chain begins skipping under load. On a B2B procurement basis, we recommend replacing chain and both sprockets together as a set to ensure optimal mesh geometry and maximise the service life of all new components simultaneously.
Does Ever Power supply motorcycle chain drive sprockets for UK electric motorcycle conversion projects that require non-standard motor shaft bore sizes?
Yes. Ever Power’s custom engineering service specifically accommodates non-standard bore and keyway configurations common in UK EV conversion projects, where motor shaft dimensions often do not match any catalogue sprocket bore. We manufacture drive sprockets with custom bore diameters from 8 to 80 mm with keyways, splines, or parallel-flat configurations to match your motor’s shaft profile. Hub adaptor designs are also available for higher-volume conversion programmes. Contact [email protected] with your motor shaft specification for a custom quote and engineering consultation.
What quality documentation and certifications does Ever Power provide with motorcycle chain sprocket orders shipped to UK industrial buyers or OEM customers?
Ever Power provides material test certificates to BS EN 10204 3.1, dimensional inspection reports covering pitch circle diameter, bore, and tooth profile measurements, hardness test records per batch, and surface treatment compliance documentation as standard optional additions to UK orders. For ISO 9001-certified customers, PPAP documentation packages are available on request. All documentation is in English and references applicable British and international standards. We recommend first-time UK buyers request a full documentation sample pack with their initial prototype order to confirm our standard meets their supplier approval requirements before placing production quantities.
Ready to Source Precision Motorcycle Chain Sprockets for Your UK Business?
Standard catalogue products, custom-engineered solutions, OEM production volumes, or racing prototype single pieces — Ever Power delivers to UK addresses with full technical documentation and competitive DDP pricing.
edit by gzl