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wheel specs aside, you're looking at an overall increase of 30 mm (possibly more depending on tire mnfr) in rubber only. essentially 15mm inside and out.
so... if your setup with 225's still have roughly 3/4" inner clearance (i say 3/4" due to 15mm ~ 5/8", plus a bit for deflection in hard cornering), a 255 will work.
keep in mind that you'll still need 15mm worth of clearance on the outside of the tire for full lock in steering as well.
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| v3.0si |  | '08 Z4Coupe 3.0si | BMW Aero | BMW Performance |
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