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YOUR RESEARCHWhat's the widest tire I can put on my 17" wheels?
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Check tirerack
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Suggestion
Check TireRack for actual diameters and approved rim widths as there is a lot of variability from theoretical.
What's the widest tire I can put on my 17" wheels?
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Suggestion · Original poster
17x8.5 (R) I need to double check the wheel width on the rears though.
What's the widest tire I can put on my 17" wheels?
Run near the wider end of the approved rim widths
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Suggestion
You actually want to run near the wider end of the approved rim widths for performance reasons.
What's the widest tire I can put on my 17" wheels?
Set tolerances
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Suggestion
What is important in buying tires is that the diameter is within set tolerances.
What's the widest tire I can put on my 17" wheels?
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225/45/17 on the front 7.5" (0.4% diamater diff which is perfect)
265/40/17 if it is a 9" rim (1.2% difference..still very good)
255/40/17 if it a 8.5" rim
What is important in buying tires is that the diameter is within set tolerances. Usually inside of 3% is the gold standard but I think Porsche allows up to 4%.
Formula is as follows:
Tire Diameter in inches= (Width of Tire*Aspect Ratio of Tire*2)/25.4+Rim Size
For Example a 285/30/18 would look like this:
(285*.30*2)/25.4+18=
24.732"
Okay so does anyone think the below is unsafe? Again, OEM 17" twists for the Carrera. Yokohama A032R's for the track.
17x7.5 (F)
17x8.5 (R) I need to double check the wheel width on the rears though.
245/45-17 (F) requires a 7.5" wheel.
275/40-17 (R) requires a 8.5" wheel.
I don't think many manufacters spec 8.5" as an approved rim width for a 275/40R17, but that's not to say it can't be done. It's just going to be a really tight fit. You actually want to run near the wider end of the approved rim widths for performance reasons. Check TireRack for actual diameters and approved rim widths as there is a lot of variability from theoretical.
