Choosing the right rear sprocket can improve acceleration, top speed, and overall drivetrain reliability for pit bikes and light dirt bikes. This guide targets common Chinese 50cc to 190cc platforms and ATV/Quad applications. Below you’ll find five well-matched rear sprockets, each with specific tooth counts and hub diameters to fit 420 chain setups. Use the buying guide to compare options based on compatibility, material, and installation needs.
| Product | Tooth Count / Center Hole | Approximate Size | Best For |
|---|---|---|---|
| 53 Tooth Rear Chain Sprocket (76mm ID) | 53T / 76mm | Centre Hole 92mm; Inner Diameter 76mm | Lower gearing for quick acceleration on 50cc–125cc |
| 41 Tooth Rear Chain Sprocket (52mm ID) | 41T / 52mm | Centre Hole 68mm; Inner Diameter 52mm | Balanced performance for versatile daily riding |
| 41 Teeth 420 Rear Sprocket (76mm ID) | 41T / 76mm | Centre Hole 76mm; Includes bolts | Standard replacement with bolts for easy install |
| RUTU 37 Tooth Rear Sprocket (76mm ID) | 37T / 76mm | Centre Hole 76mm | Compact gearing for performance on small to mid kits |
| Windance 35T Rear Sprocket (76mm ID) | 35T / 76mm | Centre Hole 76mm | Low gearing for maximum torque and hill climbs |
Note: All items are designed for 420 chain setups common on pit bikes and compact dirt bikes. Always verify center hole diameter and bolt spacing before purchase. Some listings include mounting hardware; others require separate bolts for installation.
53 Tooth Rear Sprocket For 420 Chain
Tooth Count: 53T. Center Hole: 76mm (ID 76mm); Outer specifications include a 92mm center diameter and 8.5mm screw mounting holes. This sprocket is compatible with 420 chain systems and suits 50cc to 125cc configurations. It’s important to check image and product descriptions for exact mounting hardware requirements before purchasing.
41 Tooth Rear Sprocket For 420 Chain (52mm ID)
Tooth Count: 41T. Center Hole: 52mm (ID). Includes a 68mm outer center hole and 8.5mm mounting holes. Suitable for 420 chain setups across 50cc–250cc bikes. Review the listing to confirm mounting bolt compatibility and installation notes before purchase.
41 Teeth 420 Rear Back Sprocket Cog
Tooth Count: 41T. Center Hole: 76mm. Package includes 1x sprocket and 4x M8 bolts. Sprocket diameter is about 170mm, with a 76mm center hole. This setup aims to provide reliable chain engagement across various 50cc–150cc pit bikes and ATVs.
RUTU 37 Tooth Rear Sprocket For Chinese Engines
Tooth Count: 37T. Center Hole: 76mm. Brand: RUTU Store. It targets a broad range of Chinese 50cc–190cc pit bikes and ATVs with 420 chain compatibility. The sprocket is described as heat-treated steel with corrosion resistance, designed to provide strong chain grip and efficient power transfer.
Windance 35T Rear Sprocket For 420 Chain
Tooth Count: 35T. Center Hole: 76mm. The sprocket is described as a 35-tooth black 76mm hub compatible with a wide range of Chinese 50cc to 190cc motorcycles, dirt bikes, and ATVs using a 420 chain. It is marketed as high-hardness cast iron for durability under rough use.
Buying Guide
Key considerations when selecting a pit bike rear sprocket include compatibility, material, and gearing impact. The right choice depends on your bike’s engine size, riding style, and the terrain you ride.
- Torque vs. top speed: Lower tooth counts (e.g., 35T–37T) provide more torque for hill climbs and acceleration, while higher tooth counts (e.g., 53T) improve top-end speed on straight sections. Match your riding needs to the gearing.
- Center hole diameter and bolt pattern: Confirm the center hole (commonly 76mm or 76mm with different inner diameters) and bolt hole spacing to ensure correct fit. Some listings include mounting hardware; others require you to reuse or purchase bolts separately.
- Material and durability: Sprockets advertised as steel or cast iron with corrosion resistance and heat treatment will typically last longer under dirt and mud exposure. Consider wear resistance for extended life in rough terrain.
- Installation considerations: Some sprockets come with bolts included, reducing additional shopping. Verify whether flat washers or spacers are needed for alignment with the chainline and rear hub.
- Brand and compatibility notes: While many options fit multiple Chinese-made engines, always check your model year and engine displacement. Some listings describe broad compatibility, but precise fit can vary by brand and production batch.
- Maintenance: Regular inspection of the rear sprocket and chain for wear or hooking helps prevent drivetrain failures. Replace both chain and sprocket as a matched set when wear is evident.
- Availability of replacement parts: If you rely on aftermarket sprockets, verify that the corresponding bolts, nuts, and spacers are readily available to avoid delays.
In summary, choose a sprocket that aligns with your performance goals and bike specifications. For tight trails and low-speed climbing, a 37T–41T option with a 76mm ID hub often provides reliable grip. For riders seeking higher speeds on straights, a larger 53T sprocket can help, provided the engine and chain setup permit the change. Always verify exact measurements on your specific model before ordering.