If you've got the TT front brake,you'll need the nitro bike front wheel with the grooves for the brake rotor.

On an electric bike you'll need a separate servo for the brake,use a "Y" lead if you can't mix a third channel in to the throttle.

The rear wheel will feel stiff to turn if you're using a brushed motor,it's the drag of the magnets,but make sure it spins freely before setting the gear mesh.
The ESC should provide dynamic braking when you apply your brakes with the TX.,most TX's have an adjustable end point to set how much braking you want.

The stock class in the UK doesn't allow front brakes and lap times are very close to Superbike times and usually faster than nitro bikes.

Allan