Quote:
Originally Posted by Incompatible
The Si sport suspension (M suspension) package came with the following as compared to the standard suspension: "sport" button, lower ride height (shorter springs), different shocks, larger diameter sway bars. As mentioned above the Non-M Si sport package uses different components than the Z4M.
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As an example the front sway bar diameters are 24mm for stock suspension, 25mm for M-Sport, and 27mm for the M. Rears are 18mm for stock, 19mm for M-Sport, and 21.5mm for M. Wheels for the stock Z4 are 17 x 8 square set up, (although there were a lot of staggered 18" wheel options for the stock Z4 without adding the M-Sport suspension), 18 x 8 front, 18 x 8.5 rear for the M-Sport (most common wheel for package was the Style 108), and 18 x 8 front, 18 x 9 rear for the M.