"Can someone get a measurement of the tread with of the 275 please"
Size 275/60-15 used to more available and the actual tread width would vary slightly from the different companies.
Today BF Goodrich, Cooper and Hankook all suggest a 8.9" tread width measured on a 8" rim for their 275/60-15 tires. As mentioned previously Firestone when they carried that size suggested 9.0" tread width on a 8" rim.
Actual section width on the various tires will vary as well.
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/
Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine)
Best time 5.13 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE
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