Example from old Firestone sales material, Firehawk INDY 500 tires
Size P275/60-R15
Approved rim width 7.5 - 9.5 inches
Measuring rim width 8.0 inches
SW 11.0 inches on 8" rim
TW 9.0 inches on 8" rim
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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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