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stephen wilson · 08-08-2013, 08:20 AM

With that size, I assume it's not for a Boxster? They will be 1" smaller in diameter, which is a fairly large change, especially if the car has stability control. It may be within the safe range for ABS function though? I thought up to 5% Dia. change was OK for ABS, and you would be at around 3.2% change in diameter? Don't take that as Gospel though!

The 55 is the aspect ratio is explained in spinnaker's link. ( the tires section height is 55% of the section width of 225mm )

I installed a slightly wider, and taller tire on the front of my '06 ( 235 to 245 ), and it is right on the edge for my PSM. If I increase the front tire pressure a few Psi, the "traction control" starts kicking in.

08-08-2013, 08:20 AM	#5
stephen wilson Registered User Join Date: Apr 2008 Location: Southern New jersey Posts: 1,054	With that size, I assume it's not for a Boxster? They will be 1" smaller in diameter, which is a fairly large change, especially if the car has stability control. It may be within the safe range for ABS function though? I thought up to 5% Dia. change was OK for ABS, and you would be at around 3.2% change in diameter? Don't take that as Gospel though! The 55 is the aspect ratio is explained in spinnaker's link. ( the tires section height is 55% of the section width of 225mm ) I installed a slightly wider, and taller tire on the front of my '06 ( 235 to 245 ), and it is right on the edge for my PSM. If I increase the front tire pressure a few Psi, the "traction control" starts kicking in. Last edited by stephen wilson; 08-08-2013 at 01:50 PM.