Originally Posted by US///M3
The ZCP rims have a different offset,on stock 220's 255/35R19 rubs...if you want to mislead people here,by all means do.
Like the OP, i experienced the same rubbing on 220's first hand, not based on some google search.
220M: Fronts: 19x8.5 (offset +29) Rears: 19x9.5 (offset +23)
ZCP: Fronts: 19x9 (offset +31) Rears: 19x10 (offset +25)
255/30R19 overall diameter is 25.2". (25.1" according to Michelin)
245/40R18 overall diameter is 25.7".
245/35R19 overall diameter 25.8".
255/35R19 overall diameter is 26"
265/30R19 overall diameter is 25.3"
275/30R19 overall diameter is 25.6"
275/35R18 overall diameter is 25.6"
Thank you for adding specifications to the conversation. I think that is a big help. I added a couple more in red for comparison (all Michelin PSS specs). I should clarify that according to BMW the only "right" size for the front is 245/35/19. Although they do spec 255/35/19 on the M3 GTS... As you can see above, if you want to use a size that differs from stock, the three sizes that are the closest in overall diameter to OEM are 255/35/19, 275/30/19 and 275/35/18. The 255/30/19 is the furthest away from the stock diameter (AKA worst option IMO).
I have personally used all three of the above sizes plus 255/30/20 on two different M3's (my recommendation was not based on a google search). I have had slight rub at full lock 50% of the time with 255/35/19's. My current front wheels are 18 x 9.5 et22 with 275/35/18 and I have no rubbing. I did rub at full lock on with the same wheels / tires on my previous M3 (personal experience verifying that there can be variation car to car). I personally don't think a slight rub at full lock is a large issue (and is worth the small annoyance to go to a wider tire).
I also know there are literally 20-50 threads on this same topic plus 100's of posts....And many people who have successfully ran 255/35/19's without rubbing. The tolerances are tight on the front of the M3 which creates this issue.
I don't think my post was "miss-leading" in any way. I specifically stated that some people will have rubbing at full lock with 255/35/19's depending on the tire brand, wheel offset, and specific car tolerances. I should add it is also dependent upon wheel widths (which will impact the stretch of the tire) and alignment specs. At the end of the day, I would not consider putting a 255/30/19 on the front of an M3 because the sidewall height is shorter than necessary which is a big compromise. You would be better off with the stock size (245/35/19).