Such as mountain bikes, exercise bikes, road bikes, kids bikes, etc. The excellent performance of our product will bring you a good experience. This backseat is designed for the rear rack of bicycles. You can use it without worry.Color:Black -Material:Aluminum Alloy -Size:45.00X27.00X13.00cm/17.68X10.61X5.11in. 2 x Bike Rear Rack with Accessories.