Torque thrust D and wilwood

highspeeddirt said

Thank you very much! I appreciate your input tremendously. I'm kind of stuck on the torque thrust D's and unfortunately that is the only backspacing available.
Since you said I would be better off with a 15x7 with 4.25" backspace, do you think the 215/60 15 you recommended with the 15x6 with 3.66" backspace would work better on the 15x7 with the 3.76" backspace? That is a little bit shorter than the 205/65 15 but fill up the fender well a little better than the 205/60 15's.
Thanks again!

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The 215 on the 15x7 would probably be into your fenders. You can see that the backspace between the 15x6 and 15x7 is only different by .1". That means the rest of the .9" of additional width is to the outside on the 15x7". It also means the centerline of the wheel has moved.

The easiest way to see that is with an offset spec. The 15x6" has an offset spec of about +3. The 15x7 has an offset spec of -7. So the centerline of the wheel moved out toward the fender ~10mm between the two. That's why the 215 should work on the 15x6, but the 205 is the best you can do on the 15x7. You'd need a 4-3/16" backspace on the 15x7 for the centerline of the wheel to be in the same place as the 15x6.