This is a used Mac ride attachment for pretty much any bicycle. The one rubber strap is cut on the tightest setting but the second setting works well enough. I’m including a set of handle bars I purchased separately and were very helpful. I am including the pictured stem spacers that you need, there are two spacers for use on two different bikes. It is well used but still in very good shape. It really set the stage for our boy to move up to a strider and now a MTB. This Mac ride really helped him to learn direction and what to do with his body to move into MTB. It’s fabulous and you won’t regret it if you ride regularly.