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Old 04-22-10, 10:35 AM
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The speculation about muscle physiology is pretty goofy. It's like this: when I'm too fatigued to ride quickly, or am riding slowly for other reasons, my weight is being supported less by my leg and core muscles and more by my skeleton. Well, your skeleton doesn't do very well at absorbing shock in the kind of riding position you typically have on a road bike. Which is why go-slow bikes like cruisers or old English 3-speeds have such upright riding positions. That and the fatigue due to greater amount of time on the road than you are mentally wanting to deal with are really as complicated as the answer needs to get.
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