I am a terrible welder... I put the skateboard wheel on the bike and it lasted about one block before it twisted the weld I made right off the motor. That was okay because I learned what I wanted to know by then. The skateboard wheel attached directly to the motor is a winner. In my case the weld was so bad and the attachment so out of balance that it just shook itself apart, but it will drive the bike just fine. Only if I get the thing put on correctly.