How to install bike training wheels? Step 1: Connecting the training wheel and support bar together. First assemble the bolt, wheel, gasket, bracket arm and nut in order and then fix them by wrench. Step 2: Unscrew the bicycle rear axle nut, then fix the stop block, fasten the pointed horn of stop block on the bike frame. Step 3: According the size of bike or wheel, choose the proper hole location on the support bar. Fix them with nut by slightly press strength. Step 4: Using the same way to install the training wheel of the other side.