What are the 2 fuses with my new wheel for?

There are 2 fuses already installed in the controller of your new wheel.

If the wheel is heavily overpowered, such as accelerating too hard uphill, the fuses can burn out. Then the unit will not turn on.

The fix here is as easy as replacing the burnt-out fuses with the 2 extra fuses that came with your new unit.

This doesn't happen often! King Song includes spare fuses with every wheel that uses fuses, just in case.