Naturally, on a car this shrunken there is no room for a spare wheel. Non-M versions get round this by being fitted with those cunning run-flat tires, enabling you to leave the injured wheel in place and limp to the nearest garage without converting important parts of the car's suspension into small pieces of rubble in the process.
However, run-flat tires weren't deemed high-performance enough for the harder-driving Z4 M, and the car comes with standard, burstable tires instead. A puncture repair kit is supplied, but bear in mind that a blow-out in this coupe is likely to involve a lot of fluffing about on the hard shoulder with glue and plasters — or, at any rate, cans of sealant — and that this could be the unadvertised price you pay for fancying yourself in a racing car. It's a small one, if you ask me.
RSS