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Old 05-28-12, 10:37 AM
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techguyrva
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Originally Posted by Whiteknight View Post
We have 4 Trek bikes, two of which date back to 2004. A pair of Navigators and a pair of newer Multitracks. All came with the sprung seat post. All after about a year of use developed the sideways shifting you describe. They use a plastic washer/guide with a key slot. The key slot wears with up and down seat movement. This then allows the movement you describe. I took the seat post out and went in with a socket and tightened up the nut to the point where the seat could no longer move up and down. That cured the side to side shifting while pedaling. That of course killed the sprung effect of the seat post. With a good seat and padded shorts we found we could do without the sprung seat post. It also made it easier to adjust seat height for best pedaling with knee angles. The idea of the sprung seat post adding comfort while riding is questionable.
Thanks for the reply. Am I removing the seat post from the seat to access key slot? I have tightened every bolt I could find with no luck. If removing the seat post from the seat, how do I go about doing this? Sorry, bike maintenance is very new to me.
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