These new wheels are designed for rubber tire 1/10th scale pan car racing, both oval and road. They are direct bolt on for 1/10th cars. In the rear, they use the standard 4 bolt mounting pattern commonly used in oval and World GT. In the front, they use the normal 1/8 x 5/16" bearing. The mounted tires measure around 2.45" diameter, most all pan cars can be adjusted to make the proposed 5mm ride height rule. These rims are designed to mount the best performing tires on the market; the Pit Shimizu, Tamiya TCS and CRC RT1. The rims are designed for 2 types of scale looks; low profile (sidewall) GT type cars and large sidewall NASCAR and F1 scale looks. Standard offset makes it easy to mount and go!