How two-wheeler spares are made and sourced
India builds motorcycles and scooters in large numbers, and a big replacement-parts trade has grown around them. An export order for spares is rarely one product. An overseas distributor may order brake shoes, clutch plates, chain kits, cables, levers, mirrors and lamps for a dozen models in one container. The exporter often makes some lines and buys the rest from specialist workshops: pressings and levers from one, cables from another, lamps from a third.
That set-up shapes the inspection. Each part type has its own process: pressed and plated steel, die-cast aluminium levers, injection-moulded lamp housings, bonded brake linings, heat-treated chain. But the most frequent problems are trading ones: a part made for a different model year, a box label that does not match the part, or a mirror with an approval mark copied from someone else's product. Brake shoe and pad linings for two-wheelers are covered in more depth on our brake parts page.
What we check on two-wheeler parts
| Check | How it is checked | What fails |
|---|---|---|
| Assortment and application | Every part number in the order counted; sampled parts compared with the reference sample or drawing for that model | Part for a different model or year; short or mixed cartons |
| Brake shoes | Lining thickness, bond or rivets, shoe arc and spring fit against the reference | Lining lifting at the ends; arc that will not seat in the drum |
| Clutch plates | Thickness, flatness on a surface plate, tang and spline fit, friction pads complete | Warped plates; missing or loose pads |
| Chain and sprocket kits | Chain pitch and link count, sprocket tooth count and bore against the kit list; hardness witnessed on the factory's tester | Wrong link count for the model; soft sprocket teeth |
| Control cables | Inner and outer lengths, end fittings, free movement; nipple pull test witnessed on the factory's rig | Wrong length; nipple pulling off below the agreed load |
| Levers and footrests | Pivot fit, burrs, plating or paint, folding action and spring return | Sharp edges; lever binding; cracks in castings |
| Mirrors | Approval mark read and compared with the certificate; glass free of distortion; stem thread and hand (left or right) checked | Mark without a matching certificate; wrong thread |
| Lamps | Approval or DOT marking, lens and housing fit, bulb type, function test on a power supply, seal and gasket | Lamp does not light; wrong bulb; mark not backed by a test report |
Common defects in two-wheeler parts
| Defect | Why it matters | Class |
|---|---|---|
| Brake lining separating from the shoe | Loss of braking | Critical |
| Cable end fitting pulls off under load | Loss of brake or throttle control | Critical |
| Approval mark on a mirror or lamp not backed by a certificate | Goods not legal to sell or fit in that market | Critical |
| Part in the box does not match the label or model | Returns; wrong part fitted | Major |
| Chain kit with wrong link or tooth count | Kit cannot be fitted as sold | Major |
| Warped clutch plates | Clutch drag or slip | Major |
| Plating blisters, paint runs, scratched lenses | Appearance; complaints | Minor |
Approval marks on mirrors, lamps and brakes
In countries that apply UN vehicle regulations, many two-wheeler parts carry an approval mark: a circle with "E" and the number of the approving country, followed by an approval number. The mark means a type-approval authority tested and approved that design. It does not mean every part is good, and a copied mark means nothing at all.
- Mirrors. UN Regulation No. 81 covers the approval of rear-view mirrors for two-wheeled power-driven vehicles, with or without sidecar, and their mounting on handlebars.
- Lamps and reflectors. Headlamps, signal lamps and reflectors are approved under the UN lighting regulations, and the mark on the lens identifies the regulation and function. We read the mark and compare it with the approval certificate the factory supplies; photometry is measured only in a lab.
- Brake linings. UN Regulation No. 90 covers replacement brake lining assemblies for L-category vehicles, which include motorcycles and mopeds. Its disc and drum scope does not extend to L-category vehicles.
- United States. FMVSS 108 applies to motorcycles and to replacement lamps and reflectors. Each original and replacement headlamp lens must be marked "DOT", which is the maker's self-certification. We check the mark and ask for the photometric test report behind it.
Chemical rules such as EU REACH apply to rubber grips and plastics, and origin marking follows the market's rules; see country of origin labelling.
Packing, transit and your purchase order
Mixed spares orders fail at the packing stage more often than at the machine. The inspector checks the label on each sampled inner box against the part inside, the carton markings against the packing list, and the protection of plated and painted parts. Chains should be oiled and sealed; cables coiled without kinks; mirror glass and lamp lenses padded. Steel parts need rust protection for the voyage.
Put these in your purchase order:
- Full part list with your part numbers, the matching vehicle models and years, and reference samples.
- For each lamp and mirror, the approval or DOT marking required and the certificate or test report to be shown.
- Lining thickness and bond requirements for brake shoes; chain length and sprocket tooth counts for kits.
- Cable lengths and the minimum nipple pull-off load to be witnessed.
- Inner box artwork, barcode, origin marking and quantity per carton.
- Rust protection and carton grade for mixed heavy and fragile parts.
For castings, forgings and bolts in these parts, see fasteners. Book an inspection anywhere in India.
Sources
- UN Regulation No. 81, rear-view mirrors for two-wheeled power-driven vehicles (EUR-Lex)
- UN Regulation No. 90, replacement brake lining assemblies, discs and drums (EUR-Lex)
- 49 CFR 571.108, Lamps, reflective devices and associated equipment (eCFR)
- Department of Commerce, TradeStat: commodity-wise exports (HS 8714, FY2025-26 provisional)