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Old 03-16-2010, 11:32 AM   #3
Johnny Danger
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Join Date: Nov 2008
Location: Massachusetts
Posts: 4,810
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Quote:
Originally Posted by ancster
I have searched the forum, but haven't been able to find a thread that answers my question.

What is the largest diameter wheel that will fit on the front of an '01 986 without contacting the strut/coil?

A 245/35ZR 19 on an 8J x 19H2 ET57 rim doesn't fit. Based on the tire specs, the diameter is 25.9".
Would a 235/35ZR 19 with a diameter of 25.5" work?
I all due respect, your question runs helter shelter. In order to determine proper wheel fitment, one has to first create a baseline of information and calculate accordingly. For example, what are the sizes and offsets of your current wheels ? What kind of clearance do you currently have ? What type of suspension set-up does your vehicle currently have ? And are you likely to change it ? All of these concerns have to be factored in first. There is no exactitude in this regard. However, I can tell you from experience, depending upon the offset, most enthusiasts who upgrade their boxsters typically utilize the following widths: Front: 8 to 8.5 inches Rear: 9 to 10 inches . In addition, in order to achieve correct wheel diameter, wheel (diameter) and tire size (width and aspect ratio) ideally should comport with the same diameter as the factory specifications.
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