The following are from technical service bulletin 3001, article No. 8 dated July 16, 1962. They are specifically directed at 62's but I have no doubt that they are also correct for 61's and 63's. Minimum Riding Heights in inches: Front Rear HT's 27.84 20.01 CV's 27.84 19.89 These measurements are from ground to bottom of fender directly over center of wheel.