Thread: Is a seat post a seat post?
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Old 10-26-11 | 10:31 AM
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Originally Posted by Junk083
I'm guessing steel would be more forgiving than aluminum..
You'd be guessing wrong. Since a seatpost is a short length of material with a small diameter, aluminum is going to be less stiff than steel. Aluminum has a lower modulus of elasticity (springiness) than steel. It's only when you increase the diameter of an aluminum tube do you start to get stiffness. If you increased the diameter of a steel tube, the stiffness would increase too. In fact, if a steel frame used the same diameter tubes as an aluminum bike, steel wouldn't feel as cushy.
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