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      10-15-2010, 10:38 AM   #1
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ZCP Rear Wheels and Tires up front (OE Size) question...

My inquiry is directed to ZCP owners with unmodified tire sizes and suspension:

On my 2008 E90 M3, when I ran a second pair of Rear OEM 18" Wheels and Tires up front (to eliminate the last of the understeer), the outboard shoulders of the tires rubbed the front fender liners enough to eventually make holes in fender liners. Annoying, but occasionally worth the performance benefit. Radiation Joe had the same experience on his White 2008.

Has anyone run ZCP Rear Wheels/Tires up front on the road or track?
If so, is the rub situation the same as what I describe above?

Thanks for any help!
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      10-15-2010, 11:21 AM   #2
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Isn't the offset of those wheels something like et27? That might work in front with 265/35 PS2s.
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      10-15-2010, 12:53 PM   #3
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Looks like M3 ZCP rears are 19x10 ET25 and M3 18" OE rear wheels are 18"x9.5" ET23

Joe, in your estimation, that could make the difference?
Intrigued...
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Last edited by davem3fan; 10-15-2010 at 01:11 PM. Reason: new info
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      10-15-2010, 02:13 PM   #4
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I really liked the square set-up on my first e90. But, I ended up with holes in my fender liners.

I doubt the 2mm offset difference will be enough to help. I thought you might have a chance if the ZCPs were et27.
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      10-15-2010, 02:28 PM   #5
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Maybe try your 255/35/19 (one size smaller) up front theory?
Need to break out the PS2 sizes chart.

No need until next spring anyway, but curious...
Cheers!
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      10-15-2010, 02:30 PM   #6
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I doubt if it will work unless you increase camber more than allowed with the factory suspension. I used a square wheel/tire setup in an E46 M3 with no problem, and the car was lowered. But, I generally used 2.5-3.0 degrees of negative camber in front.

I have an ’11 E92 ZCP, and was considering running rear wheels and tires in front, but was wondering about clearance. After driving the car a few months, and since I will not do much track stuff with it, I think I’ll just stick with the OE setup. The car is better balanced stock than was my E46, and I don’t find an unacceptable amount of understeer. My guess, you will need a lot more camber to avoid any clearance issue.
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      01-24-2011, 05:51 PM   #7
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Dredging up an old thread since I was thinking about it... what about just running 265/35-19 tires on the stock (ZCP) 19x9's up front? Per the tire specs they should fit. I'll have to do some measuring when I finally get my car someday :-)

Last edited by ///My5UV; 01-24-2011 at 05:52 PM. Reason: Didn't remember non-ZCP fronts were only 8.5"
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