What is the OEM tire size for 1972 GMC Jimmy?
The original brochure can be found here: http://brochures.slosh.com/It appears the standard size was E78-15B which converts to a P195/75R15Some of the optional sizes were 7.00-15C, 6.50-16C, 10-16.5C, G78-15B, H78-15B, and L78-15B.http://www.turbinecar.com/tires.htm has a very thorough list of conversion tables to obtain modern size equivalents.