The Evolve 38T Drive Gear Kit will give 20% more torque. The standard Evolve drive gear has 32 teeth and this kit has 38 teeth. Because of this you have 6 extra teeth and that gives more torque. This kit will trade off some top speed, a brief estimate on how this gear will affect top speed can be found in the table below. This kit is perfect if you want the most powerful torque from your Evolve. The Evolve 38T Drive Gear Kit is suitable for the GT, GTX and GTR Series from Evolve. It is a complete set with 2x 38T Drive Gear (incl. bearings) & 2x adjusted size GT Drive Belts.