Some versions of the old Ecolux Tornado Electric Vehicles UK had mag / composite ? wheels.I used one for a couple of years -eventually the screws holding the motor in the rear wheel started to move and were impossible to tighten fully-it still ran ok though and was the most reliable electric bike I have used.The wheels also developed cracks [surface] and the bushes on the swing arm[ made of nylon] wore quickly giving the rear suspension a I nice laateral movement. The battery lasted for a couple of years---even though I do tend to hammer my bikes.