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"I read "only" as saying other points of support cannot be used rather than saying they must all be used all the time."
So, one can only have hands on bars, not forearms on bars. One can only have bum on saddle, not on the TT. But when bum is in air it's not on any part of the bike. Otherwise we would see riders getting done for taking a hand of the bars to take a drink.
croft-
It’s clearly not important, but it’s Friday…my point on climbing and sprinting refers to this:
The rider shall normally assume a sitting position on the bicycle
In theory the UCI could do riders for taking a hand off the bars to feed, but, again we assume that is a sanctioned ‘abnormal’ position.
Ruleset is here BTW: https://www.uci.org/docs/default-source/rules-and-regulations/part-ii-road/2-roa-regulations-e.pdf
A lot of the familiar riding positions in the sport are only implicitly sanctioned, rather than explicitly. AFAICT
snoops
Leggy’s point is about aero positions, not climbing and sprinting out of the saddle, which aren’t mentioned in the rules. I guess we assume they are sanctioned “abnormal” positions.