This regarding the 15-inch tire....
"I see muscle car enthusiasts somewhat polarized. They either go full nostalgic, or are comfortable and happy to modify their cars out of their original form for reasons they’ve deemed important, like performance or aesthetics or whatever. The struggle for all manufacturers looking to cater to a niche is not if the product will sell, but will it sell enough? "
They question the development costs, the expense of creating the molds, etc for the small needs in ultra performance 15-inch tires.
Good luck finding a ultra performance 15-inch tire without the All-Season tread pattern... except maybe 23" inch diameter !
THROWBACK ROLLERS: THE 15-INCH TIRE PROBLEM
https://timelessmuscle.com/tech/whee...-tire-problem/
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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)
5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE