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Seatpost Length Question

Old 03-20-21, 04:28 PM
  #1  
praise dakinis
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Seatpost Length Question

I am looking to buy a Thomson Elite seatpost, and I really only need the 250mm but can get the 330mm for ~$15 cheaper. Itís about 40g heavier than the 250mm. Is there any problem with running a very long seatpost down the seat tube? Is there any problem with cutting off a bunch of seatpost length Iíll probably never need?
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Old 03-20-21, 06:28 PM
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There is nothing wrong with a longer seatpost with more in the tube. The less you have in the tube the more chance there is of it breaking. If you are super concerned with the weight of a little more than the average pencil on the bike you can cut your seatpost down but I wouldn't worry about it or at least make a mark the amount above the minimum insertion line of how much you are cutting off.
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Old 03-20-21, 06:40 PM
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THe only issue with going down the tube is the possibility of hitting a bottle cage bolt depending on frame size
Cutting would be make sure you have enough inserted in the seat tube.
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Old 03-20-21, 07:03 PM
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For $15 I would buy the proper size. I like Thomson posts.
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Old 03-20-21, 07:28 PM
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If you don't already own a hacksaw, a decent one will cost at least $15. Even if you do own a hacksaw, for an extra $15 you can have the seatpost you want, with a properly beveled edge on the end.
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Old 03-20-21, 07:42 PM
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All true- it occurred to me that maybe the extra long stem could come in use in the future should I decide to use it on a frame with a shorter seat tube. Hitting the bottle cage bolt is an interesting point, but I donít think itís that long.
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Old 03-20-21, 08:16 PM
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Cut off what you don't need, even on the shorter one.

Those grams don't grow on trees ya know!
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Old 03-21-21, 05:33 AM
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Originally Posted by woodcraft;[url=tel:21977122
21977122[/url]]Cut off what you don't need, even on the shorter one.

Those grams don't grow on trees ya know!
Haha- very good point. I was thinking to trim a bit off the top!
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Old 03-21-21, 05:50 AM
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I've been wondering the same thing with my Thomson Elite seatpost. I got a deal on a little longer one. It's 410mm and I think my stock one is 360? If I can clear the bottle cage bolts I'm leaving it as is. It's not that much extra weight and as veganbikes mentioned it might actually make things stronger.
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Old 03-21-21, 10:59 AM
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For me w/ short-ish legs, I can easily cut 100-120mm from a 350mm seatpost for a weight savings of 75g or more (for alloy).
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