Well the curse of runflats continues 7mm F1 RFT and it has a large bump growing on the side. So thats £200 down the drain. Going to switch to non RFT but first need to sort out a spare. I have tried a space saver from a w245 on my w246 and sods law the caliper rubs against the steel wheel inside. Just wondering if anyone knows if using a shim/spacer disc will be ok with space saver. I found some 5mm for £10 so the OEM bolts should still be fine but will allow me to put the wheel under the floor in the boot and have full protection.