Choosing the right front sprocket can optimize torque, top speed, and chain wear for dirt bikes ranging from 50cc to 160cc. This guide highlights five reliable front sprockets from HIAORS, MRELC, and RUIQIMOTO that fit common 428 or 420 chains with a 17mm mounting bore. Each option balances durability, compatibility, and installation ease. A concise buying guide follows to help you compare tooth counts, chain sizes, and bore requirements so you can select the best match for your riding style and bike model.
| Product | Brand | Teeth | Bore | Fitment |
|---|---|---|---|---|
| HIAORS 428 Front Sprocket 17T (17mm) | HIAORS | 17 | 17mm | 428 chain; 50cc–160cc dirt bikes/ATVs |
| HIAORS 428 Front Sprocket 16T (17mm) | HIAORS | 16 | 17mm | 428 chain; 50cc–160cc dirt bikes/ATVs |
| HIAORS 420 Front Sprocket 14T (17mm) | HIAORS | 14 | 17mm | 420 chain; 50cc–160cc dirt bikes/ATVs |
| MRELC 420-13T Front Sprocket (17mm) | MRELC | 13 | 17mm | 420 chain; 50cc–160cc dirt bikes/ATVs |
| RUIQIMOTO 428 16T Front Sprocket (17mm) | RUIQIMOTO | 16 | 17mm | 428 chain; wide range of 50cc–160cc dirt bikes/ATVs |
HIAORS 428 Front Sprocket 17T (17mm)
This 428 front sprocket is designed for bikes and ATVs using a 428 chain. It has 17 teeth and an eye-to-eye distance of 30mm, which aligns with standard Chinese dirt bike configurations. The 17mm bore supports common 50cc–160cc engines and similar platforms. The part is intended to provide reliable engagement with the chain while maintaining a compact profile suitable for rider responses in tight trails.
- Fit 428 Chain
- 17 Teeth
- Eye to Eye: 30mm
Typically compatible with TaoTao, Roketa, Coolster, Sunl, and Lifan models that use a 428 chain. Installation is straightforward for riders with basic sprocket changes, and the 30mm mounting spacing helps ensure alignment with the chainline. This option balances ease of replacement with an appropriate gearing change for mid-range torque and quicker throttle response in urban and off-road environments.
HIAORS 428 Front Sprocket 16T (17mm)
This 16-tooth front sprocket is built for 428 chains with the same 17mm bore and 30mm eye-to-eye spacing. A 16T configuration delivers a cleaner balance between acceleration and top speed, making it suitable for riders who want a bit more roll-out while maintaining torque at launch. It is appropriate for 50cc–160cc dirt bikes and ATVs that rely on a standard 428 chain setup.
- Fit 428 Chain
- 16 Teeth
- Eye to Eye: 30mm
Users should verify compatibility with their specific dirt bike model, including the chain size and mounting pattern. This sprocket offers a straightforward gear change that can improve throttle response in technical sections without drastically sacrificing low-end torque. It is a practical option for riders seeking a slight upgrade over stock gearing in everyday riding conditions.
HIAORS 420 Front Sprocket 14T (17mm)
Designed for 420-chain systems, this 14T sprocket uses a 17mm bore and the standard 30mm center-to-center mounting, making it compatible with many small-displacement dirt bikes and mini bikes. A 14-tooth configuration emphasizes quicker response and stronger low-end torque, which can be advantageous in tight trails, hill climbs, and beginner-to-intermediate riding scenarios.
- Fit 420 Chain
- 14 Teeth
- Eye to Eye: 30mm
Compatibility spans 50cc–160cc platforms that operate on a 420 chain, including Z50/CT70-like mini bikes and TaoTao/Roketa models. When switching to a smaller tooth count, ensure rear sprocket and chain length are adjusted accordingly to prevent chain slack or binding during operation. The 17mm bore remains a common standard for these bikes, simplifying upgrades.
MRELC 420-13T Front Sprocket (17mm)
This MRELC sprocket is tailored for 420-chain setups, offering a 13-tooth option for riders seeking increased torque at lower speeds. The 17mm bore matches common front hubs, and the mounting spacing aligns with standard 420-pattern designs. The product page notes compatibility with a broad range of 50cc–160cc dirt bikes and pit bikes, making it a versatile upgrade for many daily riders and hobbyists.
- 420 Chain, 13 Teeth
- 17mm Bore
- Front Sprocket: 420 13 Tooth
The specification mentions the gear inner diameter as 14mm and emphasizes stainless steel construction for corrosion and heat resistance. For riders performing frequent dirt work or exposure to moisture and mud, this material characteristic can contribute to longer service life and steadier chain alignment over time.
RUIQIMOTO 428 16T Front Sprocket (17mm)
The RUIQIMOTO 428 16T sprocket is designed as a broad-fit option for 50cc–160cc dirt bikes, pit bikes, ATVs, and other 428-chain machines. It features a 17mm bore and mounting pattern consistent with common Chinese models, including popular TaoTao, Boom Vader, and Benelli TNT135 variants. The product description notes an iron, heat-treated construction for enhanced durability and corrosion resistance, which helps sustain gear integrity in muddy riding conditions.
- Fits 50cc–160cc Dirt Bikes/Go Karts
- 428 Chain, 16 Teeth
- 17mm Bore; Iron Heat-Treated
When upgrading, confirm that the rear sprocket and chain length are compatible with the new front gear. This choice offers a balanced approach between acceleration and top speed while maintaining reliable durability across varied terrains and weather conditions.
Buying Guide
Key considerations when selecting a front sprocket include chain size, tooth count, bore diameter, and mounting spacing. A mismatch can cause chain rub, misalignment, or poor performance.
- Chain size: Match the 428 or 420 chain to your bike’s drivetrain. 428 is thicker and typically used on mid- to larger-displacement bikes, while 420 suits smaller bikes and minis.
- Tooth count: Increasing teeth (e.g., from 14T to 16T) generally improves top speed but reduces initial torque. A lower tooth count enhances low-end response and acceleration.
- Bore and mounting: Most front sprockets for these bikes use a 17mm bore and 30mm center-to-center mounting. Confirm your hub’s bore and hole spacing before purchasing.
- Material and durability: Sprockets described as stainless steel, iron, or heat-treated alloys offer better wear resistance in muddy or dusty riding conditions. Consider corrosion resistance for extended life.
- Compatibility: Check model compatibility, especially if your bike is a TaoTao, Roketa, Coolster, Sunl, Lifan, or similar Chinese-brand model. Ensure the chosen sprocket aligns with your rear sprocket and chain length requirements.
- Installation considerations: Proper torque, alignment, and chain tension are essential. After replacement, test ride at low speed to verify no rubbing or misalignment.
In practice, selecting a sprocket with the same bore and mounting pattern as your existing setup simplifies installation. A 16T or 17T option with a 17mm bore tends to suit many commuters and trail riders who want a versatile upgrade without altering the rear gear significantly. When in doubt, consult your bike’s service manual or a professional technician to confirm compatibility with your specific model and riding style.