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It is hard to prove non-existence, but as far as my research goes, there is no carbon frame available for belt drive systems like Gates. My guess is that this is due to the requirement to be able to open and close the frame during belt installation. However, at the same time, carbon frame manufacturers claim that they can tailor a frame's lateral & etc. stiffness by layer density, fibre orientation and the like. So my question is what is the exact reason why belt drive systems are not available on carbon frames?

...of course, I'd also be happy if my research turns out to be incomplete...

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    Have you tried Google? I can find one in the first hit for "belt drive carbon frame" – ojs Feb 2 at 10:26
  • Any frame can be used with a drive belt like the Veer, which has a join in it. No idea how good they really are. – Criggie Feb 2 at 12:04
  • @ojs: wow, I obviously always tried a wrong(?) sequence of words; with your recommendation, I've found single speed belt drive bikes, which also underlines what was answered: If your focus is weight, you go for carbon frames and light gear, or no gear at all, but not for internally geared hubs. – StefG Feb 3 at 10:08
  • @Criggie txs for pointing me to another incompleteness of my research; this definitely sounds like an idea that I should discuss with my LBS! – StefG Feb 3 at 13:52
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There is no reason a carbon fiber composite frame could not be built to accommodate a Gates drive. CFC can be bonded to a metal split dropout no problem.

CFC frames designed for Gates drives are likely not common because the frame materials and drives are intended for different niches. CFC frames are intended to be light, efficient and fast, are relatively expensive compared to other frame materials and are combined with derailleur drivetrains. Gates drives require internally geared hubs which are a bit heavy and are aimed at 'practical' cycling offering no mess and low maintenance, where CFC frames are not used as alloy frames are perfectly adequate.

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