THE B4 is fitted with 17-inch BBS forged alloy wheels, wrapped in low-profile Bridgestone Potenza RE010 tyres. A steel spacesaver spare wheel fitted with a Bridgestone Tracompa-3 TR3 tyre measuring T135/70 D16 100M is located under the floor in the boot. An A-shaped storage tray sits on top of the spare wheel and contains five separate compartment areas.