This is a pack of three optional RB Products 0.9mm Clutch Springs, and are intended for use with the RB Products RB One R and RB One 1/8 scale nitro buggies. The stiffer the spring, the later the clutch will engage allowing the engine to spool up to a higher RPM range before the clutch comes on. The later the clutch engages, the more the clutch will slip causing the clutch shoes to wear out more quickly. If you need more bottom end from your engine, consider using 1.1mm springs with the aluminum shoes.
This product was added to our catalog on January 3, 2013.