Accessory Mount Clamps (Pair)


Note: price is for one pair.

When you buy an Accessory Mount or Flag Mount, you get a pair of these very handy Cateye clamps. They are super useful in lots of other places as well. We use them in some of our Fairing Mounts, our Long Wheelbase Light Mounts, and even on some of the equipment around the shop! Get different sized pair for your already super-adaptable Accessory Mount and give it an extra dose of ultra-adaptability, or create your own uses! Seven different sized clamps fit just about any bike. Adjusting shims included to get the exact fit. The stainless steel socket head cap screw maximizes durability and strength, while the smooth, black super tough nylon makes them an inconspicuous and sleek addition to any cycle. Accessory Mounts allow for crazy clever configurations, so if your clamps need to be different sizes, make a note of it on your order.


1. What are these, anyway?

They are Cateye brand plastic mounting clamps, modified in a handy way for use with attaching our Accessory Mounts.

2. How do I know what size I need?

You need to measure the outer diameter of the tube at the point at which you want to clamp. Then, choose the size of clamp that covers the size of your tube. You fine tune the fit of the clamp by trimming the length of the provided shim (the shim isn't needed for paint protection, it's purpose is to adjust the fit).

3. You sell them in pairs, right?

Yes, this price is for a pair. If you are doing something creative that involves attaching to two DIFFERENT sized tubes, we can manage that. Just make note of this on your order.

4. Can I use them on tubes that aren't round?

Yes, as long as they are not too far off round. An oval of about 2:3 is about the max you can do.


  • These clamps are modified Cateye brand clamps. Cateye clamps are the best plastic band clamps made. We've made them even more useful by pressing in an anodized aluminum spacer and replacing the attachment screw with a stainless steel bolt.
  • The clamps come in 1/8 inch increments from 1/2 inch to 1-1/4 inch. Order the size that covers the size of tube you have.
  • Cateye brand nylon band mounting clamps with trimmable adjusting shim. Modified by adding a spacer to move the attachment point out and provide a firm base for attaching things like Accessory Mounts. We replace the black steel screw provided by Cateye with a stainless allen head bolt so you can use regular bike tools (and not have to worry about rust).
  • Compatible with all bikes and trikes with round or nearly round tubes in the range of 1/2 inch (12mm) to 1-3/8 inch (35mm).

Customer Reviews

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Customer Reviews

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1 Inch Accessory Mount Clamps

The 1" clamps do not come with a shim. I assume the 1-1/4" with a shim would fit a 1 inch tube. The packing enclosure shows a 1 inch shim as '1" SP-5, No Shim'. 1-1/8" and 7/8" also are No Shim, as shown on the packing enclosure . Otherwise, high-quality items as usual from T-Cycle. FYI, when ordering.


Hey Mike, The clamps that we are are CatEye clamps that we modify for use with our various products. They cover ranges of sizes depending on how much of the shim you use. The clamp used for 1in tubing is the SP-5, which covers from 1in to 1.07in (25.4mm to 27.2mm). The clamp used for 1-1/4in is the SP-8, which covers from 1.22in to 1.36in (31mm to 34.5mm). The clamp used for 1-1/8in tubing is SP-6, which covers from 1.04in to 1.20in (26.5mm to 30.5mm).

Ken Cook

Carefull about tightening

You have to be careful not to overtighten them. When they are snug, stop!! Over tightening causes the captive nut to turn in its plastic nest and you can never get it back off. Since they are made of plastic you can simply cut them off with wire cutters. OTHERWISE A GREAT CLAMP AND IT LOOKS GOOD.


Hey Ken, Thanks for taking the time to write a review! Sorry to hear you're having troubles with the Cateye clamps. Why don't you give us an email and we'll do what we can to get you back in action!

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