Subscribe to a magazine

Inside Of Wheel Diameter

Back to article View Gallery
8 of 13
If you don't know the diameter of your wheel cylinders, the answer is on the inside. Rather than measure the actual cylinder bore, look on the back of the cup; the diameter is usually molded into the surface of the rubber. These diameters are important should you want to calculate piston displacement or line pressures when troubleshooting or modifying a brake system. Many times, larger- or smaller-than-standard wheel cylinders can be swapped to correctly bias a system for better braking performance.