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stephen wilson · 09-06-2012, 03:20 AM

Yes, you do have to be carefull with relative front/rear diameters. I put 245/40-18's on the front of my 987, whick worked well to reduce understeer, but if I raise the front pressure more than 2 psi , it's makes the PSM kick in all the time.

09-06-2012, 03:20 AM	#9
stephen wilson Registered User Join Date: Apr 2008 Location: Southern New jersey Posts: 1,054	Yes, you do have to be carefull with relative front/rear diameters. I put 245/40-18's on the front of my 987, whick worked well to reduce understeer, but if I raise the front pressure more than 2 psi , it's makes the PSM kick in all the time.