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  1. #1
    Senior Member xfimpg's Avatar
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    What is the seatpost length that comes with a Trek 4300 hardtail in a size large?

    Hi Folks

    I have picked up a Trek 4300 (2004) hardtail in a men's Large and need to replace the suspension seatpost that's on there right now.

    Does anyone know what the original seatpost length for this model and size?

    Thanks!

  2. #2
    ÖöÖöÖöÖöÖö Dannihilator's Avatar
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    Should be 31.6
    Strike like an eagle and sacrifice the dove.
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    Senior Member xfimpg's Avatar
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    Quote Originally Posted by Dannihilator View Post
    Should be 31.6
    For the diameter I'm okay, i measured and its 30.9.
    What I'm looking for is the length of the seatpost.

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    ÖöÖöÖöÖöÖö Dannihilator's Avatar
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    Hard to say length wise. What size is the frame?
    Strike like an eagle and sacrifice the dove.
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    Senior Member xfimpg's Avatar
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    Quote Originally Posted by Dannihilator View Post
    Hard to say length wise. What size is the frame?
    Size Large.

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    ÖöÖöÖöÖöÖö Dannihilator's Avatar
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    Either a 367mm or 410mm length will work.
    Strike like an eagle and sacrifice the dove.
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  7. #7
    Senior Member xfimpg's Avatar
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    Quote Originally Posted by Dannihilator View Post
    Either a 367mm or 410mm length will work.
    Yeah, I thought 350mm would be short, its what is most commonly found on shelves.
    Thanks

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    Senior Member mechBgon's Avatar
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    Quote Originally Posted by xfimpg View Post
    For the diameter I'm okay, i measured and its 30.9.
    What I'm looking for is the length of the seatpost.
    The correct diameter for a 2004 Trek 4300 is 31.6mm, as per Trek's official spec sheet and their tradition of using 31.6mm. Sounds like someone crammed the seatpost off a Specialized in there, since 30.9 is Specialized's signature size.

  9. #9
    Senior Member xfimpg's Avatar
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    Quote Originally Posted by mechBgon View Post
    The correct diameter for a 2004 Trek 4300 is 31.6mm, as per Trek's official spec sheet and their tradition of using 31.6mm. Sounds like someone crammed the seatpost off a Specialized in there, since 30.9 is Specialized's signature size.
    well now you've got me doubing my measurements! lol
    can you post the link to the official spec sheet? Thanks

  10. #10
    Te mortuo heres tibi sim? scrublover's Avatar
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    Go by the length of what is in there now. Otherwise, make sure you've got enough length for the post to go down a little past the junction of the seat-tube and down-tube.

    Unless specified by manufacterer, that has always been my little rule.

    Most frame makers usuually suggest something along the lines of about 4" of post in the frame, minimum, but that varies by company, and sme don't specify at all.
    I believe the clouds in my coffee more than the weatherman on t.v.

  11. #11
    Te mortuo heres tibi sim? scrublover's Avatar
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    Quote Originally Posted by xfimpg View Post
    well now you've got me doubing my measurements! lol
    can you post the link to the official spec sheet? Thanks

    Since you bought it used, it's very possibly someone stuck a 30.9mm post in there with a shim for the 31.6mm tube. No biggie.

    If that's the case, you could use either size post - 31.6mm without a shim, 30.9mm with.

    Best bet: make sure you have the seat tube empty, use some good calipers to measure the I.D. of that.
    I believe the clouds in my coffee more than the weatherman on t.v.

  12. #12
    Te mortuo heres tibi sim? scrublover's Avatar
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    Quote Originally Posted by mechBgon View Post
    The correct diameter for a 2004 Trek 4300 is 31.6mm, as per Trek's official spec sheet and their tradition of using 31.6mm. Sounds like someone crammed the seatpost off a Specialized in there, since 30.9 is Specialized's signature size.
    Not really. Those are about the two most commonly used larger post sizes going, and have been for a while. I'd not call either one a "signature" thing.
    I believe the clouds in my coffee more than the weatherman on t.v.

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    Senior Member mechBgon's Avatar
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    Quote Originally Posted by xfimpg View Post
    well now you've got me doubing my measurements! lol
    can you post the link to the official spec sheet? Thanks
    I could, but unless you're a Trek dealer the link wouldn't work Lemme try attaching a copy to this post, I think PDF is allowed... darn, it's too large. Well here's the part you want (and BTW it does state the stock post length: 350mm).

    2004_Trek_4300.jpg

  14. #14
    Senior Member mechBgon's Avatar
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    Quote Originally Posted by scrublover View Post
    Not really. Those are about the two most commonly used larger post sizes going, and have been for a while. I'd not call either one a "signature" thing.
    Well I've worked at a Specialized dealership, and at a Trek dealership, and I've never seen a Spesh with a 31.6 or a Trek with 30.9. I hope you're right and they did shim it, instead of just crushing the frame down to meet the 30.9mm post.

  15. #15
    Te mortuo heres tibi sim? scrublover's Avatar
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    Quote Originally Posted by mechBgon View Post
    Well I've worked at a Specialized dealership, and at a Trek dealership, and I've never seen a Spesh with a 31.6 or a Trek with 30.9. I hope you're right and they did shim it, instead of just crushing the frame down to meet the 30.9mm post.
    Uh, yeah.

    I'm not saying anything contrary to that. Only that the seatpost size isn't exactly a "signature" of either one, considering many, many other companies use both those sizes as well.
    I believe the clouds in my coffee more than the weatherman on t.v.

  16. #16
    Senior Member xfimpg's Avatar
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    Thanks folks, it was a 31.6, and is now purchased and installed.

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