I have 235-60-15's all around on my '69 Z with stock rally wheels. I think they come very close to matching the original E70-15 (205-70-15's) tires in overall diameter as whenever I go by a digital speed indicator set up by our local police or CHP my speedometer reads spot on with what the digital speed indicator shows. I like the same size tires all around, but that is just my personal preference.
I've hunted for tires for the past month for my Z. The 235/60/15's are the tire of choice for most. The problem is that its nearly impossible to find a RWL tire in that size. The BFG's are backordered (one company said they are discontinued), same with the Firestone Indy 500's. They no longer make the Goodyear Eagle GT's.
The ones I could find were the Cooper Cobra's and Mickey Thompson's.
I ended up going with a blackwall tire. It doesn't look nearly as cool as a RWL, but they sure are easy to find in a 235/60/15.
I'm running 215/65hr15's on rear...same height as 235/60r15's but not as wide, 7 inch rally wheels...on front due to very low ride height I'm running 205/60hr15's on custom made 6 inch rally wheels. photobucket for pictures of all our rides and builds.. ALL STREET DRIVEN WEEKLY! j
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