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I've been spending a lot of time digging through available tires and wheels. Some of that was hot rod style stuff, which seems to tend to come from Coker tires. And I got into hot rod style steel wheels with dog dish center caps (again), which is roughly modeled here. It's tempting to get whitewall tires, but I don't see myself keeping them clean enough.
Steel wheels have the convenient advantage of fixing my problem of wanting huge brakes for aesthetics, but... being very impractical. And without caring about caliper orientation, maybe I can use stock Mustang hub carriers / spindles / knuckles / uprights, whatever they're called. Akerman angle would be off, longer wheelbase.
This is the first time in a long time I've attempted to model an accurate track. 2015+ (sixth gen / S550) Mustang diff, axles, hubs = 62.5" wide.
I realized that for the 14cm = 5.5" clearance, I need 20" wheels for it to roll with the tires off, which I think is a titling requirement, which I think is a fine idea. For aesthetics I want ~30" diameter tires. The narrowest tires I can find for that (that aren't too narrow, from Coker) are these 235/50-20. The 20" steel wheels I can find are 8" wide, 3.75" backspacing. Then I added the 3cm spacers. I'm assuming that would be significantly cheaper than custom lengthened axles. 0.9" clearance on wheels without tires.
Just an example of the steely aesthetic:
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Edit: My offset math was wrong, corrected in the next version that looks the same.