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Inside Of Wheel Diameter

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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.

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