JT 428 Aluminum Rear Sprocket

Item Number: 342371


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Product Description

JT Sprockets

JT 428 Aluminum Rear Sprocket

  • Made from advanced aviation-grade 7075-T6 aluminum alloy, optimal lightweight design and CNC machined for performance and lifespan
  • For MX applications, sprockets are designed with a special self-cleaning design, and hand-finished to perfection
  • Each 428 sized JT aluminum rear sprocket is heat treated, bead blasted to reduce surface friction and enhance chain and sprocket longevity
  • Every JT sprocket goes through up to 25 production stages and 10 individual quality control checks before it is ready to leave the factory

Spec Details
Chain Pitch 428
Material 7075-T6 Aluminum Alloy
Position Rear
Teeth Varies (make selection above)

Vehicle Fitment

Fitment is guaranteed or your money back plus free return shipping. Don't waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.


  • KX80 1986-1987, 1989-1997
  • KX80 Big Wheel 1991-1994
  • KX100 1995-1997, 1999


  • RM80 1982-1983, 1986-2001
  • RM85 2002-2010, 2012
  • RM85L 2002-2010, 2012


  • YZ80 1993-2001
  • YZ85 2002-2015

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