I have the original invoice fro my car and it has H78-14 listed as the tires size that the car came with. What size in the newer way of listing tires sizes would these be comparable to? I'm guessing it would be approximately the same size as a 245/60-15? I'm trying to calculate how much difference there would be between the originals and the new tires I'm getting, as far as the speedometer goes. Thanks, Scott
This link will help you convert your tire size http://clubs.hemmings.com/clubsites/chevylist/tech/tire_size_conversion.htm
H78-14's were 27.76" in diameter, with an 8.70" section width. Closest sizes would be P215/75R-15 at 27.68", and P225/70R-15's at 27.44". A P245/60-15 is 26.57" which is closest to the G60-15(26.44")
