Cobra ownership for me is all about the looks.
I built my car with 17 inch wheels initially, the car handled and drove very nice, a little rough on the road due to minimal sidewall flex.
An opportunity came to buy a suitable set of 15 inch rims, I took a gamble and bought a set of BillBoard tyres (these have a larger rolling diameter and bulging sidewalls than a "normal" 15 inch tyre).
The car now tram lines, rear tyres just scrape (easy enough fix) and I can not go any bigger with my rear brakes.
But by fark it looks a $hit load better (IMO)
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.