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seat post length

Discussion in 'Bicycle Mechanics and Repairs' started by alecstilleyedye, 27 Jun 2008.

  1. alecstilleyedye

    alecstilleyedye nothing in moderation Staff Member

    the alu seat post on my road bike has a good six inches in length more than i need. is it worth chopping it down (i was thinking of leaving it the length required + the length of the limit +1")? any potential problems i should consider?

    ta in advance.
     
  2. rustychisel

    rustychisel Well-Known Member

    No. But leave a good amount (~80mm) in the seat-tube. Cut cleanly and smooth the edges, and best to fine bevel the edges so you don't gash your fingers sometime in the future.

    Remember you've customised the post, so may not be able to swap it to another frame which requires more post... like a compact frame.

    Are you becoming a closet weight weenie?
     
  3. OP
    OP
    alecstilleyedye

    alecstilleyedye nothing in moderation Staff Member

    no, i'm just lazy enough not to want to have to carry the extra baggage.
     
  4. 02GF74

    02GF74 Über Member

    i've done this without any adverse effects.

    use a plumbers tube cutter - one of those little things with cutting wheels - to cut the alloy post; if it ecomes hard to do, use a hacksaw to fnish it - the cutting wheels will have cut the post to guide a hacksaw (not that there is any reason for the end to be squre other tna look nice).

    you need to have a certain amount of post below the clamp bolt - I cannot remember homw much - look at a new post nad thye are usaully marked - about 70 mm I'd reckon.

    ofcourse once cut, it is less likely to be useful on another frame or to sell should you want to change your post.
     
  5. dodgy

    dodgy Veteran

    Location:
    Wirral
    I personally wouldn't bother, but if you're confident, then go for it.

    Dave.
     
  6. kyuss

    kyuss Über Member

    Location:
    Edinburgh
    As long as you leave enough post that it goes a cm or two below the bottom of the top tube/seat tube junction I'm sure it will be fine. Not sure I'd bother myself. How many grams will you realistically save and would you really notice?
     
  7. Alan Frame

    Alan Frame Gnu

    Location:
    Lost In Space
    Sounds a bit anal to me ! If it's that important to pare weight to a minimum, go for a dump before you ride.:blush:
     
  8. Steve Austin

    Steve Austin The Marmalade Kid

    Location:
    Mlehworld
    At least an inch below the bottom of the intersection of the toptube and the seattube is what folk normally leave. ANything less and you'll leave yourself with all sorts of potential leverage worries.

    Bent frame or long seatpost?

    I know which one i would go for
     
  9. Steve Austin

    Steve Austin The Marmalade Kid

    Location:
    Mlehworld
    What i posted is really important with compact frames. long seatposts have more lever to bend in the frame
     
  10. OP
    OP
    alecstilleyedye

    alecstilleyedye nothing in moderation Staff Member

    it's not a compact frame, has about 3" above the seat tube, and about 8" below, which seems more than it really needs. it's a cheap alu post which is not exactly on the light side.
     
  11. 02GF74

    02GF74 Über Member


    you can say that but then why bother with any ligtweight component? just ride a $ 30 steel framed p.o.s.
     
  12. Alan Frame

    Alan Frame Gnu

    Location:
    Lost In Space
    Now, now, no need for bicycle snobbery .