Calorie-Count About.com Health
Calories Burned for Activity: Bicycling
14-15.9 Mph, Racing or Leisure, Fast, Vigorous Effort

680 calories per hour

Assuming a body weight of: 150 lbs
This is equivalent to eating any of the lines of the following table.

Quantity Description Cals
2.6 Grande Starbucks Caffe Latte - Made with whole milk 260
1 McDonald's Big Mac - With cheese 704
8.6 Glasses of wine (3.5 fl oz) 79
2.5 Snickers Bar 273
3.3 Cans of Coca-Cola 207
22.7 Carrots 30