Quote:
Originally Posted by The HACK
I don't know, sounds to me like you're making this harder than it should be.
Since the non-M Z4s uses same offset front and rear, why not just get two 255 star specs mounted on the rims, put them up front, drive around in a big empty parking lot with decent dips to see if heavy compression and/or near full lock will cause the tires to rub? If it does, put the 255's in the back, and run 245 or 235s in the front.  |
lol sorry that was not my intent. how would running staggered tires on square wheels affect handling?
Quote:
Originally Posted by v3.0si
it may have been a height issue then, but...
235/40r18 has an overall diameter of 25.40"
vs.
255/35r18 with diameter of 25.02"
= total RADIUS difference of - 0.19"
however...
235mm --> 9.25"
255mm --> 10.03"
= outer tire difference (1/2 of overall) of + 0.39"
so...
even if you're losing 0.19" in height (to center of wheel) you'll still gain 0.39" (outer clearance from centerline of wheel), and because the arc trajectory of the wheel does not change, the 255 will most likely have clearance issues on the liner.
side note: a 245/35r18 has a -0.33" RADIUS difference and a + 0.20" difference in width from the CENTERLINE, all vs. a 235/40r18.
my bet (purely based on the math) is a 245/35r18 will be the widest you can go without changing camber or suspension components on an 8.5" et42 (et40 really, since we're comparing to an 8.0" et34. the error here would be ~ 0.078", or 2mm / 25.4mm)
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thanks, i will stick to 245s. one reason i preferred the 255s was not so much for the additional width but the fact that it retained stock height. would running shorter profile make a noticeable difference in comfort?