So I reclaimed a brake off an electric chopper and put it on the 20" front tire I'm using to rebuild my dead moped. I have no idea how well this will hold up but I do have a rear coaster, fingers crossed that's enough. I tried it wheeling around the house and the washers popped out of the spokes so I put them in the vice and dished them all. It seems to work now. Has anybody used these?