I vintage race my TD on 165Rx15 Michelins. They work great, although they
are a little (a lot?) noisy when cornering hard. Another advantage is
they are better in the wet than the competition Dunlops. The only time I
can get close to the really hot cars is in the rain.
When I first started racing I used bias plys, concerned that the
additional load forces generated by radials might be too much for the
suspension. Many other folks told me that radials were ok and the way to
go. I took the plunge and lowered my LRP lap times by 5 sec.
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