Drivetrain› Belt and Chain Drive
Renthal
Renthal 02-22 Yamaha YZ 85 Front Grooved Sprocket - 428-13P Teeth
SKU: R0A9 257--428-13GP
Easy — 1–2 hours
Description
Part #: 257--428-13GP
Renthal consistently achieves perfect concentricity, fitment, load dispersion and uncompromising strength while ensuring maximum power delivery from each and every motocross front sprocket. Carefully crafted using advanced computer engineering and CNC machining.
13T, Grooved
MIA's Description
This sprocket is made from case hardened and core refined 655M13 nickel chromium steel. It features machined self-cleaning mud grooves at each tooth to prevent mud buildup and help increase wear resistance. The ultralight design offers a 10-15% weight savings.
Fitment
Fitment Guaranteed
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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | Renthal |
| Part Number | R0A9 257--428-13GP |
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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