The current Adam's Trail-A-Bike Block Sleeve Hitch has evolved and improved over the years from the older models. The current hitch is much more solid and stiffer than older hitches. Therefore, if you have a Trail-A-Bike model from 1998 (or one that has a 15mm vertical lock pin) you will need to do a retrofit to replace the old knuckle with a 1st Knuckle. A 1st Knuckle is an adaptor for the old 15mm square hole, vertical style hitches, which makes it possible to use your older Adam's Trail-A-Bike with the new and improved hitch.
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