Hi , I'd like to know the overall diameter for 7.75 x 14 tire as my car was "born" with those (RPO P62) and now i'd like to find the better possible replacement to keep the speedo more accurate in 15''. Thanks
Donald, The 7.75 X 14 tire is approximately equivalent to a F78-14 which is about 26.6" in diameter. The P245/60R-15 is the same height in a 15" tire and is the best match for the G60-15 tires that came on the 70-72 GS's