A replacement trailer hitch shim for the Adams trail-a-bike and other trailers
Trail-a-bikes
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.
Adams Trail-a-bike hitch
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.
Disclaimer
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!
Specs
Inner diameter: 34.5mm
Outer diameter 37.6mm
The file is in STL format.
Adams trail-a-bike replacement spacer shim for hitch
Download
Here is the download link. I hope this is of use to you!
I’m trying to make it easier for families to ride bikes together by sharing experiences and developing helpful products.
I’ve been needing a shim myself and the $50 pricetag that Adams puts on theirs is a little eyebrow raising. Your download link doesn’t work, any chance you can make it available again? Thanks.
Hey Dave, thanks for letting me know about this. $50 is pretty expensive for a spacer. I’ll look into the download, I think there might be some file permissions thing going on.
I’ve been needing a shim myself and the $50 pricetag that Adams puts on theirs is a little eyebrow raising. Your download link doesn’t work, any chance you can make it available again? Thanks.
Hey Dave, thanks for letting me know about this. $50 is pretty expensive for a spacer. I’ll look into the download, I think there might be some file permissions thing going on.