CVTech Driven Pulley Spring for Oversize Tire 1" or 2"CVT CALIBRATIONS MODIFICATION WITH OVERSIZED TIRES It Is Important To Know! With oversized tires, you must change gauge. The gauge suggested in the table is only a proposition and may be subject to change depending on a number of parameters, such as the size and width of the tires, engine modifications and exhaust, etc. This gauge is a good starting point based on your tire sizes. * Also, purchase a set of six weight !