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Couper, I'm showing my ignorance, but what do you mean by the number " 6.00" and " 7.00" after the 15X7 and 15 X 8.5 ? is that an offset? the exact offset is important. Beagle1 has some for sale and I am interested, so you might help me here.
Duncan<img src=images/icon_smile_big.gif border=0 align=middle>
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Duncan - Most of the Period Authentic Vintage Road Race Organizations require you to run a Vintage Bias ply race tire with DOT approval. The 6.00/15 is an old tire size standard that equates to approx 225-60-15 . The 7.00/15 is approx 2.55-60-15. these are typically Goodyear Blue streaks or Hoosier STD`s. They get real sticky when hot and have pretty impressive grip. Not good in the rain or as a street tire though.
As far as wheels go - the American Torque Thrust D seems to be the wheel of choice for the road race Vintage Mustangs.
The backspace on both the 7" and 8.5" width wheel is 3.75" so it`s a tight fit without a little fender massaging.