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Originally Posted by Johnny Danger
To put things into perspective, I run the following "aggressive" setup on my boxster .
Fronts : 19x8 +31 et with 235/35/19
Rears: 19x10 +31 with 275/30/19
* there's roughly 10 mm's or so of clearance from the adjustable perch all around.
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So if I use your set-up as a comparison, if I add 2 more inches of width overall to the wheel, I would have to subtract roughly 25mm offset to keep the same clearance on the springs which would put it at +6mm (maybe +10mm if I want to run a bit closer to the springs) on the rear. The way I would like to do it is to go conservative on the outside clearance and space the wheels away from the springs if needed. This is why I thought +19mm would be acceptable because IMO, a 5mm - 15mm spacer is completely acceptable with longer studs. On the front, I already know the stock Boxster 17x8.5 rears with +50mm will barely fit in the front and clear aftermarket coilovers so I know a theoretical +31mm should work with the 10" wide wheels.
Thoughts?