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Is 285/35/18 possible on 996tt?

porsche996tt_tpe
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porsche996tt_tpe Member

porsche996tt_tpe

Posted
Posted

Suppose the front tires spec remain the same, the rear set changed to 285/35/18. Will this ruin the diff? Or any other close tire alternative with 18" rear wheels?

Is it possible to disengage front diff and drive normally?

Thanks!

  • 2 weeks later...
King James Member

King James

Posted
Posted

Check the Miata tire size calculator, lets you do direct comparisons. http://www.miata.net/garage/tirecalc.html

Its saying the 285/35 is 3.4% smaller so not the same ratio as 295/30. Will it cause problems? Well the rear tires will be smaller than the front if your running the 235/40 so there will be a variance between front and rear. Can the diffs soak up 3.4% change in ratio? Well, many guys go to the 315/25 and it's 3.2% larger and seems to be fine. So i'm guessing yes.

Why not buy the proper size tire or are you getting a deal?

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