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.
1. Optimized Torque & Speed Balance: 42 teeth design boosts low-to-mid range torque (ideal for climbing or accelerating with loads) while maintaining usable top speed for highway riding.
2. Superior Wear Resistance: Heat-treated (HRC 55–60) steel construction hardens tooth surfaces, reducing abrasion from chain contact and extending service life by 35% vs. standard sprockets.
3. Perfect 428 Chain Compatibility: Precision-machined tooth profile matches 428-series chains (12.7mm pitch), eliminating chain slip, noise, or premature wear.
4. Impact-Resistant Build: Alloy steel core absorbs shock from rough terrain (e.g., dirt roads, potholes) without chipping or bending, ensuring durability in harsh conditions.conditions
1. Mid-Displacement Street Motorcycles: Fits 125–400cc sport bikes, cruisers, and naked bikes (e.g., Honda CB300R, Yamaha MT-03) as a rear sprocket for balanced performance.
2. Dual-Sport & Off-Road Bikes: Used in 200–400cc dual-sports (e.g., Suzuki DR650S, Kawasaki KLX300) to enhance off-road torque for climbing and trail riding.
3. Light Utility Motorcycles: Compatible with 150–300cc cargo bikes or delivery scooters (e.g., TVS XL100 Heavy Duty) to handle load-bearing demands.
4. Custom Drivetrain Upgrades: Ideal for riders modifying mid-displacement bikes to prioritize low-end power (e.g., off-road conversions, urban commuting tweaks).
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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) |
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