Id say yes. For 30 and 50miles TT even though I don’t drink much I stick a soft hydration bladder down my Skinsuit. For the 25milers I have done (40km) I have just got away without one, amazingly for the 30deg C average one I did. If you in any doubt I’d carry something.
Good point…it will be around 10-15 degrees…
You’ll probably get away without one then, I would get away without something but we are all different.
Yes i will test it in training without drinking…i have a aero bidon, so take a bidon with my will no problem, but drinking will cost me some speed…
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That’s been my approach on 25milers to carry something, I have never actually used it but once over the line I have been glad of it 
why glad with it when you dont have used it?
I should have said never used it in the race, but once over the line something to drink at hand is a Godsend 
Its usually hand for a couple of swigs on the ride to the start pre race too.
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Aero bottles usually take some care to replace in their cage, so you might lose a few more seconds than you think.
I have used a gel flask with liquid in before now, it holds a good couple of mouthfuls. I just tucked in a top tube bag that I carry a puncture kit in (if there is no rescue available).
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I found this: Ad-libitum drinking and performance during a 40-km cycling time trial in the heat - PubMed
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I probably wouldn’t put too much faith in it as we are all different. I wouldn’t drink for 40km (although I do carry a bottle, it fills the hole in the frame and is useful before/after), my ex coach an ex British level pro reckoned he needed it whatever the distance.
tl;dr. Last sentence of the abstract:
whether or not participants consumed fluid during exercise did not influence their TT performance
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Lol first TT of the season I was 19s down on the PB (25s according to RWGPS, lol 13s according to Strava). If I’d started better I might have been closer to it, but for the first mile or two with 40mph gusts I barely pedalled and got held up a bit at the big roundabout (in the 3rd mile). Not as much as my minute man who was flying and overtook me at the roundabout. For the briefest of moments I actually started to catch him again, as he was slowing for traffic and probably turning a bigger gear. A few 100 yards after the roundabout he steadily disappeared 
. Despite the lack of pedalling and the roundabout delay, I was still 32 s up at the turn and whilst dropping time into the head wind (helped by getting through the return roundabout quicker than my pb) I roughly stayed ahead until the last 2/3 of a mile. So for a season opener in tough conditions I’m fairly happy with it.
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Assuming you had a shallow front due to wind gusts that day?
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The weather has been pretty grim for TT riding, well done for getting out!
We finally had a nice day yesterday, if a bit cold, so I actually did a bit of riding in TT position.
Planning on starting my season at Kings Lynn on Saturday. I got excited when I saw I was last man off, but a certain Joe Skipper is riding too (and several of the faster riders who have started their seasons already).
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TT Szn kicked off this weekend for myself in the UK (T254/1R for those interested) and getting to try out some new bits of kit picked up over winter, notably the Kask Mistral (but also the Huub Aero crop top). Really like the fit and interface it has with the shoulders/upper back.
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Good result, Jamie!
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Looking Fast!
I picked up a mistral this season but the fit seems off, I seem to have a bigger gap from the back to the helmet and it doesn’t stay put.
Also, how do you clean the visor? I try to clean mine and it just seems to get worse lol
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My visor is in a pretty bad state if I’m honest. picked up the helmet 2nd hand and the visor was peeling badly when I got it. When I need to clean it I will most likely just use baby wipes or something similar
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I d like to know that too. My Kask Bambino visor (almost identical) became unusable as it steamed up all the time. The mistral visor so far, touchwood, hasn’t steamed up. I use a micro fibre cloth (the one for my spectacles) to wipe it :-/
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