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New Tires?

Discussion in 'E81/E82/E87/E88 (2004-present)' started by gpdavis2, Jan 29, 2019.

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    gpdavis2

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    Time for the run-flats to go. What are the largest size tires that will fit on my stock 2013 128i wheels? Would like to go up at least one size, if possible. But, don't want any rubbing.
    Thanks.
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    MGarrison

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    What size wheels & tires are you on now?
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    gpdavis2

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    Stock wheels. Looks like it is simple enough to go with 225x45/17 on the rear and stay with the 205x50/17 on the front. Wife's C350 runs assymmetrical tires front & rear (225 & 245) and have not found it to be any big deal.
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    MGarrison

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    I didn't check all the 1er wheels here (http://www.realoem.com/bmw/enUS/partgrp?id=UP73-USA-10-2013-E82-BMW-128i&mg=36), but it looks like the 17" stock rims are 7x17, 47mm offset, or possibly rears of 7.5x17 width, interestingly, the same 47mm offset.

    It looks like the staggered rear size you mention is what the stock staggered setup would be for 17's, so the issue there would be more what front clearance is if you wanted to go wider up front and keep it a square setup. The advantages of a square setup is you can rotate the tires front & rear, which helps to even out the wear since the rear has some neg. camber and the front stock camber is zero (or, almost always on stock street BMW's). In any case, that's easy enough, but with a staggered setup the only way to even out the wear is have a tire shop dismount the rears, flip them on the rims, re-balance, & re-install. The other effect is the handling balance, a staggered setup will make the car understeer more, vs. a more-neutral handling balance if on a square setup.

    This is handy for comparing wheel & tire differences - https://www.rimsntires.com/specspro.jsp
    With the fitment guide from Apex wheels here - https://support.apexraceparts.com/h...1541993-E8x-1-Series-Wheel-Tire-Fitment-Guide - you can compare the stock size wheels & offset with what you might want to consider. If a 235 can fit all around on their wider wheels with the right offset (albeit possibly needing added neg. camber up front), it may be a 225/45 can fit up front on the stock 7x17's without rubbing or measures like adding neg. camber to ensure clearance. I think 225's should be ok on a 7" wide wheel, I've run 225 r-comps on 15x7's for my E30 for years. I'd say call Apex and see if they can confirm 225's on the stock 17's with that offset can fit up front on your E82. I think 7" rims start to get too narrow to try to stuff a 235 on them, plus there's Apex's notes on additional clearance problems.

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