Brian Conway 264 Report post Posted May 25, 2019 275/60/15 tire on a 15x8 wheel with 4.5 back space. Will this set up fit on the rear of a stock 69 Mach 1. Thanks, Brian Quote Share this post Link to post Share on other sites
bartzzimpson 18 Report post Posted June 21, 2019 This should help https://www.mustangdepot.com/graphics/tirefitmentguide69-70.pdf Also, my 15x10s detailed here ... 1 grendi reacted to this Quote Share this post Link to post Share on other sites
grendi 16 Report post Posted June 21, 2019 yes, that chart is the best starting point. other useful links: http://www.gtsparkplugs.com/Offset-to-Backspace.html convert offset to backspace http://www.gtsparkplugs.com/Backspace-Offset-Calculator.html convert backspace to offset https://rimsntires.com/specspro.jsp compare two rim/tire combinations Quote Share this post Link to post Share on other sites
1969Fstback 58 Report post Posted June 22, 2019 I have 18x10s with 275/35s and 6.37 in back space. My wheel if math is right would be out .23 inch further. But your rim being narrower your tire would stick out past rim and inch. So .78 inch out further. I have space without out the fender rolled but I'm lowered an inch. Inside you'd have no issues I don't think. Outside you be close to the tire hitting. Quote Share this post Link to post Share on other sites
1969Fstback 58 Report post Posted June 22, 2019 Quote Share this post Link to post Share on other sites
