Originally Posted by JamesV
Sheldon - that's interesting. Thing is, a cyclist doing a century ride will need well over 280 calories per hour. Even at 17mph on flat ground a 160-lbs cyclist needs over 600 calories an hour.
It's my understanding that you don't need to (or want to) replace all the calories that you're burning while you ride. For most of us, it would be difficult to ingest the 600-800 calories we burn per hour on the bike. But, replacing 250-350 calories per hour ensures your body won't run out of glycogen (i.e., you won't bonk).