I try to be hydrated when I start. It's not a terribly long time to be without water.
Lately I've been thinking about putting a plastic bottle cage on my seat tube. I'm pretty sure that a cage on the downtube would interfere with the way that I shoulder my bike, but actually I think I'm far enough forward relative to the seat tube for a bottle there to clear sort-of okay - it'd be up against my back, but maybe not interfere with how I carry the bike.
Run-ups seem to be out of fashion in my region. One of my teammates started using a bottle cage late last season. He races in a higher category than me, so for over an hour a lot of the time.
Bottle cages inhibit the proper carrying of a bike for most people. You can always keep one of those small gel flasks in your jersey or inside your spandex along your lower thigh just to wet your whistle. You should really be able to go 40ish minutes without more than a few sips. If you're dehydrating, then you were already like that before the race.
It has nothing to do with cool factor. Placing a bottle back in your jersey pocket while aero/at speed is a pita for most. Suffer for the win, winning is the point of racing, no?
USAC rules actually prohibit feeds in CX unless the temps are above a certain limit, so handups from the sidelines aren't generally allowed. If you carry your own you can drink from it, but we had some 'issues' with handups at some local races where they were threatening DQ for anyone who took a handup under that rule. Depends on the officials as well, though. Personally, I don't carry anything since my skinsuit has no pockets and a cage gets in the way when you shoulder the bike, but if you really think you need a sip in that 45+1 lap then do whatever suits you.
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