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I have fitted a frame bag to my carbon bike frame so I have lost my water bottle mounts. As it's carbon frame I'm aware that you can't mount clamps on the carbon like you would for steel. However, I have come across the Top Peak Versamount, do you think this will be ok?

All help and views appreciated.

Mike

https://www.topeak.com/us/en/products/accessories/1093-versamount, Top Peak Versamount

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  • Should be okay, not really worse than the straps of your frame bag ;) They don’t look like you could tighten them too much. I’d wrap some tape around the frame to prevent scratches in case they move slightly. – Michael Aug 5 '20 at 5:55
  • Thanks Michael - I agree with your sentiments there. – hydev Aug 5 '20 at 20:33
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There are also seat-post mounted bottle cages.

See Profile Design Aqua Rack ii Dual Water Bottle Cage (Black) (Seatpost Mount) for an example:

enter image description here

That one even has places for screw-in CO2 cartridges.

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  • Thanks Andrew, but its $50 so roughly £40 so more pricey than the clips but that would not wobble or potentially move around. – hydev Aug 5 '20 at 20:34
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There are also clamps to fix cages to the handlebars (remember those pictures from olden days) unless those are carbon as well. Cages may also be attached to the rear of the saddle or to the seat-post.

The frame material is likely too thin and will not resist crushing from clamps.

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Whether they will work will depend on the shape of your frame. Many carbon frames are tapered, being wider near the headtube and narrowing as the go back. This will mean the clamps will have a tendency to slide toward the narrow end of the tube. A small wrap of inner tube under the clamp may help some but I think it will still be problematic with the weight of the full bottle. I would recommend either a saddle or seatpost mounted cage similar to a Skekane Elite which can hold three cages.

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    Or else a water-bladder in the backpack as the last possibility. – Carel Aug 4 '20 at 20:14
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    Of course hydration packs must not violate VELOMINATI rule #32. :) – mikes Aug 4 '20 at 20:21
  • I think that the idea of bikepacking seriously violates The Rules in many different instances ;-) but then VELOMINATI seems to be almost defunct. – Carel Aug 5 '20 at 9:32
  • Good point there about the carbon frame and it moving. You can't go too tight but then might move.. For £10 the option might be to just try it. – hydev Aug 5 '20 at 20:35
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As you probably know intuitively, a metal tube has the same properties in all directions (the technical term is that it is isotropic). A carbon tube may not have the same properties in all directions, i.e. it can be engineered anisotropically. This is one of the main selling points of carbon. Carbon frame tubes aren't generally engineered to withstand significant clamping force.

That said, this item looks like a pair of ratcheting straps made of nylon or some other plastic. They probably don't close tightly enough to damage the carbon. They should be fine. The question is how securely they will hold the water bottle.

While we don't make recommendations for specific products, if you were thinking of mounting a bottle on the underside of the downtube, then the Apidura Expedition Downtube Pack fits a bottle in a pouch, and has one thick and durable Hypalon strap to secure to the frame. While Apidura is a premium manufacturer, it's likely that other manufacturers will put out similar designs at lower prices.

Another easy option for water bottle carriage is stem bags, which strap to the handlebar and the stem. You can mount one on each side of the stem. These may be called feed bags as well (Apidura uses this term for their own bag). One potential minor downside is that depending on your physical proportions and your bike geometry, your knee may hit the bag when climbing out of the saddle. One 2015 review of a few feed bags is here. Depending on your cockpit setup, some handlebar bags have space for water bottles at either end of the bag, although I believe this arrangement is more common for long-distance road touring than for gravel or bikepacking. Do note that an overly loaded handlebar bag can alter your bike's handing, whereas feedback I've heard from stem bag users is that they don't really change the handling much. You also can't fit that many items in a stem bag.

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    Yes for the load on the bar and the negative effect on handling. – Carel Aug 4 '20 at 19:58
  • Thank you for the comprehensive answer there - you raise some very good points and I like the downtube bag. As you say Apidura is a premium make so £52 is quite a lot. I wonder if I could make one? Possibly yes. I also take your point about the handling. I have stuffed my handlebar bag with rags and gone for a few rides to get used to the feeling. – hydev Aug 5 '20 at 20:39

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