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  1. #1
    viva la v-brakes!
    Reputation: FishMan473's Avatar
    Join Date
    Jan 2003

    Salsa Shaft Seatpost cross section?

    So I just broke a carbon seatpost right at the seat clamp. I don't blame the seatpost so much as the frame. The inner diameter of the seat tube is slightly wider then it should be for a 27.2 post, so you really have to crank on the seat clamp to secure a seatpost. I think this crimped the post and killed it.

    Anyway, I want something a little tougher, and it needs to be pretty long (I have 28 cm of seatpost exposed). The two that seem like they might work are Thomson and Salsa Shaft. I know that, in cross section the Thomson has a thick front and back that would take this clamping force well, but it costs twice as much as the Shaft. I don't know what the Shaft looks like in cross section. Is the inner diameter the same all the way around or is it ovalized like the Thomson or otherwise reinforced?

    My other option is the Ritchey WCS post that came with the bike, but I have to raise it up about 15mm higher than the minimum insert line for the saddle to be high enough for me. I'm not sure how strict these minimum insert lines are.
    I have a car. I made a choice. I ride my bike.

  2. #2
    mtbr member
    Join Date
    Apr 2008
    I used a 27.2, 400mm Bontrager Race X Lite post for several years without any issues, aluminum core with carbon wrap. Very tough, pretty light and a lot of cool details. I think most people on MTBR think that Thompson is the way to go on a seatpost. I would not use a post above the minimum line, you can damage your frame and/or post.

  3. #3
    Join Date
    May 2009
    Get a Thomson. Period.

    My weiner is 10.5".....Oh wait...I'm holding this ruler backward.

  4. #4
    mtbr member
    Join Date
    Mar 2004
    The Shaft has the similar cross section - thinner on the sides, thicker front and back. I am notoriously rough on seatposts. I had been using Thomson for quite a while without a problem, but have been on a Shaft for about 3 years now with no problems. 220 lbs on an El Mariachi. Make sure to grease all the bolts and surfaces on the top mechanism to avoid creaks.

  5. #5
    The Human Arrow
    Join Date
    Jun 2004
    I think you oughta consider an Eriksen :

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