15-21 for Yamaha YZF-R1 M SUNSTAR SPROCKETS Rear Sprocket 39-Tooth Gold 5-348539 Power with social responsibility

Power with social responsibility

Thanks to an innovative universal clamping system

120/80-19 and 90/100-21 sizes for popular 4-stroke applications

2 YKK® zipper secured utility pockets (upper chest)

Plug & Play wiring connections shorten installation time

15-21 for Yamaha YZF-R1 M SUNSTAR SPROCKETS Rear Sprocket 39-Tooth Gold 5-348539 Power with social responsibilityManufacturer: Sunstar MPN: 5 348539 Title: Aluminum Works Triplestar Rear Sprockets Option: 520 39T Color: Natural Use only the highest quality aerospace grade 7075 T6 aluminum for high strength and light weight and computer designed weight reduction holes are included for even less weight Exclusive tooth and valley design gives you 24% more chain contact area for a better transfer of power to the rear wheel and a larger area to distribute the chain