There are two basic times you need to consume calories. At rest and during exercise. The fat burning that will cause a loss of weight is not burned during exercise that requires "performance".

Exercise prefers fast metabolizing calories from carbs and glycogen. First the stores of glycogen then the carbs in sports drinks, powerbars, and other fast foods.

Your body burns 12 calories per pound per day. Even if you are sitting on the couch watching the Tour, and only get up to grab a beer and take a leak.

"According to Tony Leyland, a kinesiology professor at Canada's Simon Fraser University, a pound of muscle typically burns 30 to 50 calories a day at rest, while a pound of fat burns only three calories a day".

So fitness is kinda of a slippery slope if you stick with it. The more muscle you have the more fat you burn while doing nothing. Your new muscle metabolizes the excess fat, not while you are riding your bike.

People who start lifting weights often gain a bit of weight quickly(muscle) then the fat and lbs come off later.