Posted by Harold H on March 22, 2010 at 08:21:07 from (71.28.11.76):
A lot of the younger users may not be aware that the American Tire Manufacturers changed the standard designations for tire sizes three times over the years.For convience I am posting a chart of the different sizes and also the different tread designations.
TIRE SIZE CONVERSION CHART 1932-1940 1940-1955 1955-PRESENT 7.00 TO 8 TO 8.3 7.50 TO 9 TO 9.5 8.25 TO 10 TO 11.2 9.00 TO 11 TO 12.4 10.00 TO 12 TO 13.6 11.25 TO 13 TO 14.9 NONE NONE 15.5 12.75 TO 14 TO 16.9 13.50 TO 15 TO 18.4 NONE 16 TO 19.2 NONE 17 TO 20.8 NONE 18 TO 23.1 NONE NONE 24.5
TIRE TREAD DESIGNATIONS R-1 REAR FARM TRACTION TREADS R-2 REAR FARM RICE & CANE TREADS R-3 REAR INDUSTRIAL SMOOTH TREADS R-4 REAR INDUSTRIAL TRACTION TREADS F-1 FRONT FARM SINGLE RIB F-2 FRONT FARM MULTI RIB F-3 FRONT INDUSTRIAL MULTI RIB (I-1)
The post 1955 size designations are still in effect but do not cover many modern radial and metric and special profile tire size designations.
Harold H
I hope this will clear up some folk's future tire questions.
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