A replacement Trail-a-bike hitch seatpost shim to help fix your trailer

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.  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.

 

Adams Trail-a-bike hitch
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
Adams trail-a-bike replacement spacer shim for hitch

Download

Here is the download link.  I hope this is of use to you!

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