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Are internally-geared hubs UCI legal? I am assuming no one would ever use one for a race since durability and reliability matter less in a pro race than weight and efficiency, but I am also assuming that the UCI nevertheless put some stipulation in its rules to address them, just because. If so, what part of their code pertains to this?

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  • “durability and reliability matter less in a pro race than weight and efficiency” – definitely not true for downhill MTB. Oct 26 at 19:13
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Here are the UCI's rules governing bikes (jump way down to 1.3). After a quick perusal, they seem to be silent on the subject of internally geared hubs or multi-gear mechanisms in general, which is surprising considering how detailed their rules on sock length are.

They do, of course, prohibit multiple gears on track bikes.

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  • 5
    Good find! I suspect IGHs are like cantilever brakes or knobbly tyres, perfectly legal to use but come with more downsides than upsides for a road-race situation so there's no advantage.
    – Criggie
    Oct 25 at 22:54
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    IGH don't allow quick road-side wheel changes. The simplest reason why they will not be seen in the peloton.
    – Carel
    Oct 26 at 11:08
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    Your multiple gears on track bikes comment was subtly hilarious.
    – kloddant
    Oct 26 at 13:07

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