A replacement trailer hitch shim for the Adams trail-a-bike and other trailers
We use an Adams Trail-a-bike (aka Tag along, as some people call it) to tow our child occasionally. It is kind of like a tandem bike attachment for kids. The steel hitch slides onto a seatpost, and clamps on via 2 bolts and a hex-wrench. The other end of the hitch has a square-shaped key and a hole for adding a retaining pin to hold the trailer in place. There are spacers included that fit in there for different seatpost diameters.
We have a Weehoo trailer as well, and this shim should fit that hitch as well. This may also work for other tag along bikes, like the Weeride Co-Pilot and the Kazam Co-pilot. Both of those clamp onto the seatpost of the adult's bike.
We sometimes swap the trailer between bikes. Unfortunately, the bikes have different seat post diameters. I was trying to set up for a ride the other day and could not make the Trail-a-bike hitch fit onto the seat post. None of the included spacers either, which was pretty frustrating! I may have clamped the hitch too tightly in the past, and had bent it as a result. The smallest spacer was too big.
Designing a new spacer for the trail-a-bike hitch
A new spacer is a simple part to design, so I made my own that you can download if you need one. I made this for a seatpost with a 30.6mm diameter.
I'm making this available without warranty, etc. If you choose to print and use this, you accept all responsibility and liability for the use of the part!
- Inner diameter: 34.5mm
- Outer diameter 37.6mm
- The file is in STL format.
Here is the download link. I hope this is of use to you!