The color is likely contributing, but its an optical illusion of the low profile tires. A lot of guys with Z3s and 3 series seem to claim this, when moving to lo-pro tires, the wheel gap seems to grow, hence why most modded 3s, 5s and Zs have are lowered.

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BMWCCA Chapter President, Hawaii Chapter (fmr)
03' X5 4.4i, 02' MCoupe, 99' MCoupe (sold), 88' M3, 01' E39 M5