SUNSTAR Rear Sprocket 520 40T, Steel, Yamaha 85-06

• Constructed of high-quality, aerospace grade 7075 T-6 aluminum
• Computer-designed weight reduction holes for lightness
• Exclusive tooth-valley design provides 24% better chain contact area for the best power transfer possible
• Finished with a clear anodized coating that adds durability and a superb finish
• Grooves added at bottom of tooth area

STEEL OEM REPLACEMENT REAR SPROCKETS

• Constructed of the highest quality 1045 high-carbon steel
• Exclusive heat treatment and quenching process for strength and durability
• Nearly all machines come equipped from the factory with this sprocket
• The strongest, longest lasting steel replacement sprocket available

POWERDRIVE COUNTERSHAFT SPROCKETS

• Constructed of the same great quality and specifications that the Japanese OEMs have trusted and used since 1946
• Manufactured from case-hardened chromoly steel for unparalleled strength and durability
• Most race applications feature drilled weight-reduction holes (depends on application/tooth size)
• Parkerizing surface treatment prohibits rust and corrosion, building resistance against those agents, resulting in a longer lasting, better appearance