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This is the size most people are using for the 21" wheels on the BMW.. When the car is lowered on the H&R's it's gonna be a gamble depending on the offsets of the wheels. 35mm should clear the rear, 40mm would be ideal. I don't think you're gonna have any issues with the fronts.
Fronts - 255/30-ZR21 - 93Y
Rears - 295/25-R21 - 96Y
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