I'm using the 275/60R15 Nitto NT 555R Drag radials for the street, rated at 27.76" inflated with a 11.1" overall width measured on a 8" rim.
On the street I run them with 28 lbs pressure.
Current front tire is the Cooper Cobra Radial G/T 245/60-15
( Old picture here is with the previous Firestone 215/65R15 tire on the front
https://www.motortrend.com/uploads/s..._left_view.jpg )
I changed to the larger Cooper tire for it's larger footprint to aid in breaking.
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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