did 4*25 and a bit kilometre laps near my house in Leeds. (Route is here http://www.gmap-pedometer.com/?r=1756478 - the route is hard to make out, Im posting it mainly to get a sense of the elevation/distance etc...) Was relatively hilly, and was pretty cold (still wintery here in England for some reason). The waterproofs I had on to protect against drizzle are non- breathable(!!!) so it was a bit like wearing bin liners - loads of sweating. Hands were getting cold. I did the first 50 kilometres at about 21 kilometres an hour. The second 50 kilometres at about 18 kilometres an hour. My bike is a couple of years old marin point reyes hybrid - it is well maintained and currently in decent condition.
I have previously done (Imperial) centuries and found them fine, but found this fairly heavy going today. Apart from being shortish laps near my house (which I think is boring/harder mentally to keep going) I think being alone, not wearing great clothing, and crucially, not eating enough were the reason for me finding it tough. Here is what I had:
before - 4 bits of toast + marg and marmite
just before - orange
15 miles in - breakaway chocolate bar '100 calories'
about 20 miles - apple
30 miles - bowl of stewy type thing
45 miles - apple
finish - loads was starving.
Drank in total about 3 litres of water in total.
Re-reading this post it sounds a little bit dour - dont get me wrong I did enjoy it, but what do you reckon?