Speared Tyre

To make space in the engine compartment for the supercharger, BMW relocated the battery to the floor of the boot, where the spare wheel would go. Then they shod the car with run-flat tyres. The tyres work as promised, but cost $265 each to replace, and don't have enough grip. So I switched to sticky Toyo tyres as used in SCCA spec Miata MX5 road racing. The grip is very good on a dry surface and the wear is acceptable for such soft rubber.

Because there's no spare wheel, I carry a can of tyre inflater. On the drive home from work I got a flat and used the can to inflate the tyre and seal the leak. It works! I drove the 45 miles home without losing anymore air.