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The Motorcycle Sprocket 428-42T is a core rear (or countershaft) sprocket designed to pair with 428-standard roller chains—widely used in mid-displacement motorcycles. Its "428" designation aligns with the industry 428 chain pitch (12.7mm), ensuring seamless meshing with 428 chains (e.g., 428H, 428X). The "42T" denotes 42 teeth, a popular specification that balances torque output and top speed: more teeth enhance low-end pulling power (critical for off-roading or heavy loads) without excessive speed loss.
42 teeth design boosts low-to-mid range torque (ideal for climbing or accelerating with loads) while maintaining usable top speed for highway riding.
Heat-treated (HRC 55–60) steel construction hardens tooth surfaces, reducing abrasion from chain contact and extending service life by 35% vs. standard sprockets.
Precision-machined tooth profile matches 428-series chains (12.7mm pitch), eliminating chain slip, noise, or premature wear.
Alloy steel core absorbs shock from rough terrain (e.g., dirt roads, potholes) without chipping or bending, ensuring durability in harsh conditions.
| Specification Item | Details |
|---|---|
| Sprocket Type | Motorcycle Rear/Countershaft Sprocket (428-Spec) |
| Chain Compatibility | 428-Series Roller Chains (Pitch: 12.7mm / 0.5 inch) |
| Tooth Count (T) | 42 Teeth |
| Construction Material | Heat-Treated High-Carbon Steel (1050) or Alloy Steel (42CrMo) |
| Surface Treatment | Black Oxide / Zinc Plating (anti-rust) or Hard Chrome Coating |
| Tooth Hardness | HRC 55–60 (Surface), HRC 30–35 (Core, for toughness) |
| Mounting Hole Pattern | Universal fit (varies by model; typically 4–6 bolt holes, 50–70mm PCD) |
| Outer Diameter | ~170mm (calculated as: Pitch × (Tooth Count / π) + Pitch) |
| Thickness | 6–8mm (standard for mid-displacement motorcycles) |
| Compatible Engine Range | 125–400cc 4-Stroke Gasoline Engines |
| Typical Service Life | 15,000–25,000 km (paired with regular chain maintenance) |
This sprocket is designed to pair perfectly with standard 428-series roller chains, including high-performance variants such as 428H and 428X chains with a 12.7mm pitch.
The 42-teeth configuration offers an optimized balance between torque and top speed. It boosts low-to-mid range torque, making it excellent for climbing and accelerating under load, while maintaining functional top speeds.
It is constructed using heat-treated high-carbon steel (1050) or alloy steel (42CrMo). It features a hard tooth surface (HRC 55–60) for wear resistance and a tough core (HRC 30–35) for impact resistance.
With regular chain lubrication and alignment maintenance, the typical service life ranges from 15,000 to 25,000 km.
This sprocket is designed for 125cc to 400cc mid-displacement motorcycles. It features a universal mounting hole pattern, typically matching 4 to 6 bolt configurations with a PCD of 50mm to 70mm.
