I did my first 100 mile TT on Monday: the Anfield 100. Before this I'd done TTs up to 25 miles and also at 12 and 24 hours, so this was filling the hole! FWIW my 25 mile PB (which will hopefully fall next week (EDIT: it did fall, I got 58:43)) is 1:01:21 and I got 3:46:04 on the Anfield, which is not regarded as a very fast course afaik. I've written a full report on YACF, over on the Ride Reports section. Here's the course; we did an out and back on the dog leg, then did 3.9 laps of the circuit.
Eating: I had what I thought was a lot of food the night before, but this was sandwiches on the train rather than a proper meal, so it was hard to judge. I was off at 06:15 so I didn't eat that much for breakfast, which is something to bear in mind if you also get an early start. In retrospect I really should have had more, as I felt hungry throughout. I took four gels (one for each lap) and two spare energy bars, and just about survived on what I had. I dropped one of the gels 1/4 slurped, at which point I knew I'd need my second energy bar. I was annoyed by this because the first one had been really hard to open - I actually had to stop to get someone else's supporter to open the second one for me!
Drinking: There was a neutral drinks station that we passed on each lap, so I left them bottles to be handed up on laps 2 and 3, at 57 and 75 miles. I took two 700ml bottles with me at the start (one of water + electrolyte tablet and one of coke) and my bottles for handing up were both 500ml bottles, with the same combination of drinks. I ended up drinking nearly all of my second coke bottle but hardly touched the second water; I should probably have emptied it before the final lap when it became obvious that I had enough to go on. The big name riders (winner was Richard Handley of Rapha
Condor Sharp) had their own support cars to hand them bottles etc.
As for your time, have a look on the CTT results section and you'll see that 5 hour times are not exceptional, so you won't be holding everyone up. However, I'm sure you'll go faster than that - be bullish about it! You are one crazy-fast motha, remember
I'm considering doing a 100 mile TT but I have a few questions:
1. I'm not going to be fast; will the organisers hang about if I take 5 hours?
2. The most I've done are 25 mile TTs where no food is needed and one water bottle is more than enough, how do people manage for water/food on a 100, especially if it's hot? Is it just a case of taking two bottles, or do you need a helper to pass more from the roadside (is that even allowed)?
This should do for starters. Cheers