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      12-21-2017, 03:03 PM   #8
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Drives: 2011 135i
Join Date: May 2017
Location: San Antonio, TX

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Originally Posted by Luca335 View Post
Help needed here! The guy from tire shop told me 255/275 combo won't work for the 19" OEM 1M rims. He said the 255 275 tires would be "shorter and narrower". I don't really understand, I am going up one size from 245 265, how can that be narrower, and shorter (35 on both).
Sounds like you need to find a different tire shop. The guy there clearly doesn't know what he's talking about. The first number in a tire size ex:245/35R19 is the width in mm so you're right that they'll be wider. The second number is the aspect ratio of the sidewall height to the width, so on in the example above 245x0.35=86mm sidewall height. Upsizing you tire width without changing the aspect ratio means that the new tires should actually be slightly taller than your old tires.
2011 BMW 135i ///M-Sport, DCT
MHD Stage 2, VRSF DP, cp-e Charge Pipe, H&R Front sway bar, BMW performance diffuser