Dear Vern: 
 VF> The way I had it explained to me was this - it doesn't matter as 
 VF> much how much you weigh when you lift a weight. If you're doing 
 VF> dumbell curls with a 25Lb weight in your right arm, and a 20Lb 
 VF> weight in your left, one arm is going to tire faster than the other 
 VF> - not because of your weight, but because of the weight you're 
 VF> moving.
 VF> 
 VF> The bike is what you're moving, in this case. Road bikes, 
 VF> especially: the more you can take off the bike, the better. 
Sorry, I have to disagree.
The analogy doesn't hold.  Dumbell curls only work one isolated part of 
the body and it's true that body weight plays a small role.  OTOH, the 
weight of your arm as a part of the total system is small.  Here we're 
talking about moving all of you and the bike and body weight usually is a 
much larger portion of the total system.
When you accelerate, you must overcome the inertia for the whole system: 
bike plus body.  A lighter body will allow you to accelerate faster.
When you climb, you must lift the bike and your body to the top of the 
hill.  A lighter body will allow you to climb faster.
Tailwinds to you,
Steve
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