On all of the SeatSide Mount System kits, the main mounting arm is 7/8” (22.2mm) diameter, the same as bicycle handlebars. This means that anything made for handlebars will work with the Seatside Mount as well. The main arm comes with a tab for securely mounting handlebar bags, and it's supported by a highly adjustable system of tubes and clamps. Depending on the design of your trike, the system may attach to the seat frame, the main tube, or to another sturdy place. For folding trikes, a Quick Release option lets you easily remove 90% of your Seatside Mount so nothing interferes with the fold!