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One of the great things about triking is how nice it is to have everything right at hand as you roll along. With a SeatSide mount, you can have all sorts of things close at hand. The Catrike SeatSide Mount lets you carry bags, water bottles, cameras, all sorts of things, right by your side. Snacks, phones, lip balm, you name it, now you can keep it all within reach while riding.

This Main Tube Attach version of the SeatSide Mount for Catrikes attaches to the main frame tube behind the seat. We make other SeatSide Mount versions that attach to the bottom of the seat or the back of the seat, depending on the model. We recommend this version of the mount for people who want maximum versatility in where things are located, or need quick on/off removability. If you plan to go to a double sided mount in the future, order the OneBolt Release version for a super simple later upgrade.

Note on fit to various Catrike Models: The 559, Trail, Villager, and Pocket use one configuration. The Dumont uses a slightly different configuration, and the place it needs to attach is also where a battery mount needs to attach. Fitting both is tricky with a TerraCycle Battery Mount and impossible with the Catrike Battery Mount. The 700 and Expedition have main tubes close to the back of the seat, and there isn't much room between them. It's not that it can't be done, but it depends on you and the amount of tension in the seat mesh. For those trikes, we recommend our Seat Attach version which clamps to the horizontal seat tube under the seat. For legacy trikes like the Road, Speed, and Dash, contact us. 


1. How does it work?

A specially machined clamp attaches near the rear of the main tube. Smaller clamps sideways on the frame clamp hold a support tube that comes out sideways and down from the main tube. The end of the support tube has a T clamp that holds a horizontal accessory mounting tube. The accessory mounting tube is long enough to hold whatever you'd like.

2. What is the advantage of this over the version that attaches to the seat frame?

There is one important advantage: the OneBolt Release option lets you quickly remove 90% of the mount to make your trike smaller for folding or transport. A second advantage is if you want a double sided mount, it is less expensive to configure it this way because the central frame mount is shared.

3. How adjustable is it?

Very. Since everything is clamped, not welded, you can adjust things up/down, in/out, and forward/back. If you want to really customize it, you can shorten any of the tubes, or even substitute another of a different size.

4. Which side does it go on?

Either, or both, with the double sided option. It's up to you.

5. Will this work with a other trikes?

Yes, this mount will most likely work on other trikes with 2.0 inch round main tubes. We make a range of main tube clamp sizes, email us for more information about what's possible. The horizontal support arm in this kit is optimized for Catrikes and other trikes where the main tube tracks the angle of the back of the seat (Performer, Actionbent, etc.)

6. What can you put on it?

Anything that you can attach to a standard 7/8in (22.2mm, standard handlebar size) tube. So, most anything that's made to be mounted to a bike. Most people attach handlebar bags, water bottles, phones, things like that. The supplied accessory mounting tube is 11 inches (28cm) long, so you have lots of room.

7. How much weight can it hold?

A lot, but obviously it has it's limits. We're saying 10lbs (4.5Kg) to be on the safe side. We do recommend that if you want to carry living things (like pets) that you do so carefully.


  • The OneBolt Release option allows you to quickly and easily remove nearly everything for folding and/or transport. With 1-2 turns on a single collar clamp bolt, the main pieces slide out, leaving only the frame clamp and a short tube left on the trike. Reinstalling is just as easy, just slide the main part of the mount back in and tighten the one bolt. The OneBolt Release option replaces the Y clamps that hold the support tube to the Frame Clamp with larger ones and adds an intermediate slotted tube with a collar clamp. The intermediate tube is slotted at both ends to enable the double sided option.
  • The double sided option shares the frame clamp and intermediate tube, and adds another collar clamp, sideways support tube, T clamp, and accessory mounting tube. That's why when you pick the double sided option, you automatically get the OneBolt Release.
  • We include a user installed catchpost in case you want to use a handlebar bag that is designed to index to the handlebar stem on an upright bike. Some handlebar bags have a cable or an arm that is designed to catch on a handlebar stem to keep the bag from rotating down. The catchpost provides a place for that to connect.
  • We make a lot of tubes and clamps that are compatible with this system if you need to do customizations. Check out the SeatSide Mount Hardware and Cockpit Mount Hardware pages for more information.
  • Clamps are CNC machined aluminum, anodized black, with all stainless fasteners. Tubes are black powder coated aluminum with removable black end caps.
  • The mount can be set up on the left side, the right side, or both sides. Attach the frame clamp to the main tube near where the chainstays come in. Insert the support tube into the sideways clamps on the frame clamp. Insert the accessory mounting tube into the T clamp, then sit in the seat and decide where you'd like the accessory mounting tube to be. Tighten all of the clamps, you're ready to go!
  • Fits most Catrikes. There are some limitations on some models, see above or email for details. For instance, the suspended trikes have so much going on with the main tube behind the seat that there is not much room to attach things.