DERBI GPR/SENDA 2006->/RS50/RS4/RX50/SMT/RCR (ref: 468209)

The DOPPLER crankshaft is made of forged solid mass, corrected with an aluminium balancing tap, which reduces dead volumes at bottom-engine while ensuring maximum balancing and good momentum. It is equipped with a heat-treated forged connecting rod and an INA needle cage, chromed nickel silver treated for high engine speeds.