I don't want to re-invent the wheel

leblanc said

For my fronts I use 205/70-15, you could go lower but then the headers usually don't like it as much.

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This will go in no problem on any wheel. The checking wheel is a 5.5, but I would try to put it on something a lil wider, like a 6 or even a 7. Sevens work well on my S. And on the wider wheels you can run a lil more pressure.