JT Sprockets standard steel sprocket, manufacturer reference JTR839.57. Designed for replacement or adjustment of the gearing, this 57-tooth sprocket fits transmissions using a chain pitch of 428. Its steel construction (C49 carbon alloy) aligns with common practices for motorcycle transmission components, providing the expected mechanical strength for both on-road and off-road use.
- Brand: JT SPROCKETS
- Type: Standard steel sprocket
- Material: Steel (C49 carbon)
- Color: Black
- Number of teeth: 57
- Chain pitch: 428
- Manufacturer reference: JTR839.57
Suitable for Urban, Cross, and Roadster environments, this sprocket is ideal for daily city commutes as well as track outings or sporty rides. Be sure to check compatibility with the output sprocket and the mounting (pin, bolt spacing) before installation. Examples of compatible models include: YAMAHA WR 125 X (DE07), WR 125 R (DE07), and VITY 125 (SE42) — verify the year and transmission configuration of your machine.
Choose this sprocket to achieve precise gearing and integrate your 428 chain kit without major modifications to the transmission.
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