I've only had my M135i for a week and have already noticed the amount of dirt / grit that collects inside the wheel rims. I noticed how bad they were yesterday so cleaned them last night. A 20 mile drive to work and back in the rain today and they are just as bad. You can hear the grit bouncing off the arches so it must either be a wheel or tyre issue. Has anyone else noticed the amount of dirt and grit that sits inside the wheels ?