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The physics model of cycling power and speed has been validated in the real world. Two examples are this and this. The model embedded in's online calculator is based on these two papers. Whether the amount of difference calculated by the validated models is worth it to Joe and Billy is a question that can't be answered by the physics.


This largely depends on rider goals and finances. Your example clearly highlights the advantage of a light bike (although aero is probably equally important). If Joe and Billy are racing, and they are exactly the same, we can assume Billy is going to win. If Joe can afford it, and wants to stay competitive with Billy, it will likely be worth it for him. ...


I'm 40, and have back and joint issues that make getting up in the morning hard work. If I get-up-and-go its terrible for the first half-hour. So here's what helps me: Full flexion of joints. That means pushing your limbs to the ir comfortable maximum extensions then holding for a few seconds, then a little further. Nothing rough. A hot shower - where ...

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