SeatPost Sizing....Does 31.2mm exist??- Mtbr.com
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  1. #1
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    SeatPost Sizing....Does 31.2mm exist??

    The seat on a Haro V1 broke. I'm trying to replace it and I don't have a micrometer. To the best of my ability, I measure it to have a diameter of 31.2mm. I measured with a straight ruler across the bottom, as well as dividing the circumference by pi. Both are almost spot on 31.2mm. I can't find any seatpost in this size though??
    I also looked up haro's specifications, and they list it as a 27.2mm, which is clearly is not.

    What am I doing wrong? I can find a 30.9mm or a 31.6mm...will either of these two work?
    Suggestions would be great, as I don't know were to go from here...

    Thanks.

    Almost forgot, the old seatpost is made by Kalin, and lacks any meaningful marking as to its size, hence my measurements above.

  2. #2
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    Quote Originally Posted by Sob Rogue
    What am I doing wrong? I can find a 30.9mm or a 31.6mm...will either of these two work?.
    www.bikepedia.com says a haro V1 takes a 30.9 seatpost.

  3. #3
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    Quote Originally Posted by Sob Rogue
    The seat... What am I doing wrong?
    1. If the seat broke, you don't need a new seatpost.
    2. You need to have that ruler re-calibrated!
    Sometimes, I question the value of my content.

  4. #4
    Mantis, Paramount, Campy
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    31.2mm Certainly Exists

    A quick search didn't turn up anything high end but there are several brands of them on par with your Kalin.

    No markings for real? I've never owned a seatpost that didnt have its size listed right below the minimum insert line. Unless of course its been cut shorter....
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  5. #5
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    Quote Originally Posted by erik1245
    1. If the seat broke, you don't need a new seatpost.
    2. You need to have that ruler re-calibrated!
    I actually broke the rails on the seat, and subsequently broke the vice for the rails on the seatpost.

    Quote Originally Posted by sprunghunt
    www.bikepedia.com says a haro V1 takes a 30.9 seatpost.
    I bought the bike in 2005, which according to your website, has a 27.2mm bike post. I'm pretty sure its a 2005....but then again maybe I bought the 2006, at the end of 2005, I don't remember.

    Quote Originally Posted by Shayne
    A quick search didn't turn up anything high end but there are several brands of them on par with your Kalin.

    No markings for real? I've never owned a seatpost that didn't have its size listed right below the minimum insert line. Unless of course its been cut shorter....
    A google search for me only brings up 1 result, a company in the UK, doesn't really help me, as I'm in the US.
    And, yes the only marking on it is 2060, which I think may be the aluminum type.


    I guess I'll just play a little game of roulette....I'm leaning towards the 30.9 as its fairly close to my measurement, and in light of sprunghunt's find. Not sure though.....

  6. #6
    Doesntplaywellwithmorons!
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    I've got a frame that takes a 31.4 post size which is an oddball also (but not so oddball that I couldn't get a Syncros Hardcore post for it, or a Kalloy Uno), so I don't doubt someone out there made frames that were reamed out to take 31.2.
    I don't post to generate business for myself or make like I'm better than sliced bread

  7. #7
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    You could always get the 30.9 and shim it with a coke can if the seat post is indeed 31.2. I've done it a few times with 26.8 posts on bikes that take 27.2. Never had a problem and I rode some of them like that for years.

  8. #8
    the giant.
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    did u measure the inner diameter of the seat tube or the outer diameter?

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