I just put these 315/60/15's HOOSIER DOT Drag Radials on My 67 Valiant and I could easily go another inch wider. 10" rim, 11.1 tread, 29.7 tall. My wheel openings are stretched to accept the taller tire.

6001620-MVC-156F.JPG (1447 downloads)

SRT DEMON ONE SEAT