Renthal 51-Tooth Rear Sprocket for Kawasaki KX100 KX85 KX80 191U-420-51GESI

If you're running a KX85, KX80, or KX100, sprocket choice directly impacts acceleration, top-end speed, and overall drivetrain efficiency. The Renthal 51-tooth rear sprocket delivers a precision-engineered upgrade that reduces unsprung weight while maintaining the durability needed for aggressive riding conditions. Its self-cleaning mud grooves ensure consistent performance even in the toughest terrain, eliminating the maintenance headaches of traditional steel sprockets.

Built from 7075-T6 aluminum alloy, this CNC-machined sprocket is approximately 66% lighter than steel alternatives, translating to quicker acceleration and reduced rotational mass. The silver anodized finish provides reliable corrosion resistance, while precision-cut grooves at each tooth actively shed mud and debris to maintain optimal chain engagement and extend component lifespan.

• Tooth Count: 51
• Chain Size: 420
• Position: Rear
• Material: 7075-T6 aluminum
• Weight: 66% lighter than steel
• Design: Self-cleaning mud grooves
• Finish: Silver anodized
• Compatibility: Kawasaki KX100, KX85, KX80
• MPN: 191U-420-51GESI
• Fitment: Bolt-on