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Originally Posted by ihavedrivenanm1
Until some one can show me an official BMW spec I disagree that the M-Sport wheel is noticeably thicker than the U.S. spec ZSP wheel.
In the photographs below you can use the inside height of the multi-function buttons [the taller pair] for scale. In both photos the taller pair of buttons is the same dimension as the thickness of the round, or non-thumb section of both wheels. The sections used are immediately next to each other in terms of their plane of focus thus any distortions will be proportional.
Given that the buttons are a fixed dimension between all e90s, I am convinced that the wheels are of the same thickness save perhaps for a 1/16 of an inch or less [almost imperceptible] down to the difference in the types of leather used.
The point: I submit that anyone basing their decision to buy the M-Sport wheel on the assumption that it is thicker, that is that this is the primary reason for getting it [not the ‘M’ badge, not the perforated leather], that these people will be disappointed.
Cheers.
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Frankly speaking I want some hard evidence too. The diameter seems the same: 369 mm) perhaps only the perforated part is slighly thicker.
When I bought my 545iT, I ordered the regular heated sport steering wheel. This version is slighty thicker because of it heating option. I didn't like the M-Sport Steering wheel and to me the E80 (1Series) and E90/E91 perforated steering wheel (and shifting knob) looks rather cheap as well.