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Wow, thats a tight fit.
In Germany they do this mod with a 135i rear rotor. That also has a nice fit and more offset so the spacer between caliper and trailingarm can be smaller. (similar to the x3 rotor I used for this mod).
And they fix the parking brakeshoe issue by placing a metal ring inside the rotorhat to fill the space. I thought that was also an elegant solution (but requires machining obviously). Thats something I'm probably going to do too if my rear discs ever wear out in years to come.
They can't alter the brake shoes due to legal issues.
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Z4 3.0i | ESS TS2+ supercharger | Quaife ATB LSD | Brembo/BMW performance BBK front/rear | Schrick FI cams | Schmiedmann headers+cats | Powerflex/strongflex PU bushings | Vibra-technics engine mounts | H&R anti rollbars | KW V3 coilovers/KW camber plates | Sachs race engineering clutch | tons of custom sh#t
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