Here's my current setup:
Pre-lci E90 335xi
Lowered on KW-V1 coilovers, adjusted to 1/2 inch vertical wheel-fender gap in front and 1.5 inch vertical wheel-to-fender gap in rear.
Front wheels: 18" x 8.5" Apex ARC-8 with 235 Michelin PSS
Rear wheels: 18" x 9.5" Apex ARC-8 with 265 Michelin PSS
The horizontal tire-to-fender gap in the front is about 15 mm.
The horizontal tire-to-fender gap in the rear is only about 7 mm.
Question: Does it make sense to put wider spacers on the front wheels, maybe 12 mm, and thinner spacers in the rear, maybe 5mm?