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If you need a treaded track tire for vintage, the Toyo R888 can be had in a 235/50 for the rear and a 225/50 for the front.
If you can run Hoosiers, 245/50 and 225/50 is what I've been running on 7's and 8's, and a friend runs them as well on his car with RS flares. The 273/35/15 and 225/45 Hoosier is definitely the hot setup for 15's in PCA, but you already have a 7/31 R&P so you'll need to do some calculations on the gearing change. The SC guys love them but they have to stick with their 8/31.
I had 205/50 and 225/50 Toyo RA1's on my 7's and 8's as street tires for a while and I hated the look-way too small on the front.
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