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Old 07-14-2012, 09:03 PM   #1
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17' Square Tire & Wheel Setup

Does anyone have experience running a "Square" setup with 17' 255/40's on all four wheels?

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Old 07-14-2012, 11:17 PM   #2
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Boxster Spec Allows 245/40/17 Square

Non-staggered wheel setups
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
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Old 07-15-2012, 01:43 PM   #3
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Originally Posted by SlotCar View Post
Does anyone have experience running a "Square" setup with 17' 255/40's on all four wheels?
Yep, I have run this setup periodically since 2009 as have most Texas SPBOX drivers. What do you want to know?

My impressions:
More ultimate cornering grip.
Tires can be moved around to all 4 corners to maximize life.
Brake bias moves forward so the car tends to duck more in braking zones. Front brakes overheat more easily and wear out faster.
A bit slower on long straights. (more un-sprung weight/rotational mass and windage)
Is it faster? Maybe in AX, not in my car on the track.
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor
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Old 07-16-2012, 12:30 AM   #4
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Like topless I run it in my SpecBox. I honestly can't say I find any difference worth talking about. If anything I feel like the steeing feel quality deteriorates. I do it so I can move my tires front to back witch saves a little cash. What have you got in mind?

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