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Old 09-03-2006, 12:17 PM   #1
Pacobeagle
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Default Benefits of running a wider pair of front tires...

What would I benefit from by say running a pair of 315/35R17 V710s on the front and a pair of 275/40R17 V710s on the rear? I've heard of people doing this but why?

Mind you this is on my '02 WRX with CCW 17x10's

Jose
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Old 09-03-2006, 12:22 PM   #2
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another way to add rotation since the front contact patches are wider than the rears.

also, some cars like the '04 sti in AS can't fit 275's in the rear.. so 275 front, 245 rear is what they run. the added rotation is a nice bonus.
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Old 09-03-2006, 12:56 PM   #3
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Okay, I understand.

Jose
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Old 09-03-2006, 12:58 PM   #4
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As long as the diameters front and rear are close. Tire Rack says 3/64th for an AWD car, to prevent the difs from fighting each other, leading to premature wear.
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Old 09-03-2006, 05:12 PM   #5
Patrick L
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Good combo is a 285/30-18 front and 245/40-17 rear witht he hoosiers and there is only a .1" difference.
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Old 09-03-2006, 06:00 PM   #6
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according to tirerack there isn't a difference in overall dia. The only difference is that they each(315 vs 275) were measured on a wider wheel.
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Old 09-03-2006, 11:23 PM   #7
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If you were ONLY using them for autocross, you could get away with slightly less equal diametered tires too.
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Old 09-05-2006, 09:35 PM   #8
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Quote:
Originally Posted by waktasz View Post
If you were ONLY using them for autocross, you could get away with slightly less equal diametered tires too.
indeed.
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Old 09-06-2006, 01:00 AM   #9
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Small quantities of certain poisons will not hurt you in the short run either.

I wonder if there is any empirical data on different diameter wheels/tires vs. differential life. I'm sure one can get away with a certain amount for a certain length of time. I GUESS it would be OK if your center dif lasted 33K instead of 120K.
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Old 09-06-2006, 06:22 AM   #10
Pacobeagle
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Hmm, poisons.....I wonder what you mean by that? Are we talking fuel, I was planning on tuning it on VP's 103octane.
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Old 09-06-2006, 02:01 PM   #11
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Our experienced drivers going to Nationals warn about unequal roll diameter here:

http://forums.nasioc.com/forums/show...7#post15145057

... basically the center dif will keep trying to send extra power to the slower (taller) tires ... heating up and stressing out the center viscous differential.
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