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Old 07-22-2004, 09:44 PM   #1
aznatama
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Default +20mm track on front only?

I've heard of race cars running slightly wider front tires to compensate for FWD-like tendencies in AWD cars, so I'm wondering how a +20mm(10mm spacers on each side) track increase on the front of my STi will affect handling?? I have 235/45/17 tires...
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Old 07-23-2004, 09:57 AM   #2
Luke@tirerack
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well ... the tires would most likely rub the fenders and the additional width would create a little quicker turn in but, in a steady state turn the alteration in the scrub radius would have an adverse effect
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Old 07-23-2004, 12:00 PM   #3
Jon Bogert
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Quote:
to compensate for FWD-like tendencies
What?! Who said that increasing the scrub radius would do that? That's the exact opposite of what every manufacturer does to improve the driving of FWD cars. There's a reason that FWD cars have the brakes pushed way out into the wheel, with as small a scrub radius as possible.
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Old 07-23-2004, 07:41 PM   #4
aznatama
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scrub radius? you mean the contact patch width relative to the centerline of the car right?

anyways, I don't ahve any rubbing issues, and doesn't a wider trak give better handing/traction in the corners? hmmm... I guess I'll see how it handles b4 I bother myself with lathing another pair of spacers...

Also, I was referring to FWD racecars running wider front tires, not increasing trak.
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Old 07-23-2004, 11:00 PM   #5
Jon Bogert
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Please Google on "scrub radius" and learn more about it before you add spacers. Specifically with respect to FWD cars, since the torque steer effects will be similar to an AWD car under power. RWD cars can get away with positive scrub and it's all good. Once you start putting power through the front wheels, though, the rules are different.
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