If you have a 10-1/4" or larger diameter brake upgrade, the stock spare wheel will not fit on your Fiero. We have modified the stock Fiero spare wheel so that it will still store into the spare tire cavity, even with forward mounted batteries. We accomplish this by cutting out the center, reversing it, and welding back in place. Shown at left is the hub side (mounting side) of our modified wheel. This spare wheel upgrade will work with any brake upgrade. Send us your spare wheel (without tire) and we will modify it.