Rear tire sizes treads

Posted by Harold H on March 14, 2002 at 06:01:59 from (207.244.60.88):

Sometime in the last few days somebody asked a question about rear tire sizes. In the old size designations such as 11-38, 12-38, 13-38, etc, the first number indicated the width of the tread in inches and the second number indicated the diameter of the rim. Sometime in the late 50's they changed to the current method of size designation such as; 12-38 became 13.6-38, 14-38 became 15.5-38, etc. In the new designation the first number is the cross section width of the tire in inches and the second number is the rim diameter in inches. On most bias tires the cross section aspect ratio is approximately 1 meaning the cross section width of the tire is about the same as the cross section height or the tire. If the tire is a radial tire, designated by a "R" on the size, most also have a cross section aspect of approximately 1, however the overall ride height of a raidial tire of the same size as a bias tire will be slightly lower because the radial tire has much more flexable sidewalls. Some tires are low profile tires designated by a "L" on the size. These tires usually have a cross section aspect ratio of approximately .75 or .80 meaning the cross section height is about three quarters or 80% as much as the width. Basic tread types are designated R-1, R-2, R-3, and R-4 or modifications of these tread designs, R-1 being regular tread lugs, R-2 being rice and cane lugs, R-3 being diamond or block tread, and R-4 being industrial type lugs.

Harold H

Follow Ups:

• Re: Rear tire sizes treads ralph 18:33:26 03/14/02 (0)
• Re: Rear tire sizes treads Bleedinred 17:24:18 03/14/02 (0)

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