Bike Type - Training wheels work best on bikes 24” - 29” Solid Build - Steel frame with 6 inch rubber tire wheels Included - Comes with all mounting hardware and installation instructions Intended Use - These training wheels are for riders weighing up to 220 pounds Mounting - Ensure there is a mounting point for extenders to be installed Compatiblity - May not work on Electric Bikes, Beach Cruisers and some Variable Speed bikes with derailers