Because of:
Hondas.
Current ITA Rules.
I do believe the whole reason IT7 exists is because of the uncompetitive nature of a historically popular car. It has thinned the herd of what was a very large chunck of cars. This idea could help corral things.
I do not enjoy a spec tire in IT7. It would be better served to be open tire. Particularly given the R888 & RA1 shift. Throwing your eggs in a basket with a basically untested tire is not a good risk. Spec Miata is addressing this issue here.
Their spec tire rule has ended up costing front runners more than open tire rules. There are a huge number of downsides to a spec tire. Namely fueled by no competition and monopolies. I used to be a Spec tire proponent until I went down that path. It is not a good idea, nor stablizes costs, nor stabilizes competitiveness. It is mostly idealistic theory and hope by it's proponents.
Don
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