Re: original tire size?
My '72 has G78-15 on the spare. I was looking on Coker Tire last night and they had a graph on there on bias tire size and radials. So G78-15= 225/70-15 and H78-15= 235/70-15. I'm running 235/75-15 on mine for now.
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1990 Chevy Silverado (My DD)
1978 Chevy Bonanza LWB (My LWB to SWB 1 day project)
2015 Hyundai Sonata (Wife's DD)
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