Dumb Tire Question: Any reason to match profiles F to R?

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12-10-2011, 10:19 AM

#16

Gary Knox

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I have 295/30 X 18 on the rears of both 928's. Have 255/35 X 18 on the front of one, with 235/40 X 18 on the front of the other. Wheel widths are 10" both cars, 9" on the 255 front and 8" on the 235 front.

Gary--

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12-10-2011, 04:13 PM

#17

jon928se

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Quote:

Originally Posted by S4ordie

Not the experience Jwise and I have. We both run 17 inch wheels/tires on the front, 18 inch on the rear. The tires have almost identical OD. I run 255/295 (F/R) for an excellent ride and handling combination.

Should have been more specific - my reply corrected.

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12-11-2011, 11:41 AM

#18

FredR

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Quote:

Originally Posted by Speedtoys

If I use a say, 35 profile tire in the rear, is there any reason why I shound/need/have to stay with a 35 up front?

Say:

285/35/18 rear (11" wheel)
245/45/10 front (8" wheel)

?

Theory says you should keep the rolling radius more or less constant F to R to avoid malfunction of the ABS system.

Despite folks trying all sorts of bizarre combinations no one to my knowledge every posted of ABS failure.

Mind you- those 10 inch front wheels of yours may test the limits a bit!

On a more cautious note, I would not run a 285x35 section cos of the slightly reduced acceleration due to gearing impact. If you do use the combo you suggest, check that the wheel size can take 245 section safely. A 245x45 will fit fine on a 16 inch rim but check to ensure it still works on a 18 inch- assuming someone makes such a size.

Regards

Fred

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