Whether you need stump pulling torque or screaming top end speed from your HPI Firestorm, here are the parts you need! HPI is proud to announce a line of optional clutch bells for the Firestorm in sizes ranging from a  17T all the way up to a huge 21T! These clutch bells come in 0.8m pitch for smooth power transfer and more gearing options for your Firestorm. So if you are looking for an easy way to heat up the streets or blast down the track, make sure you have the gears you need!