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  1. #1
    N* Bomber Crew
    Reputation: Raptordude's Avatar
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    Carbon Fiber Seatpost Question

    Okay, this may very well be the DUMBEST question ever on MTBR.

    But can you cut a Carbon Fiber Seatpost?

    I am assuming you can't. But has anyone done it? Bad things happen? Just want to know cause I might toss a carbon fiber seatpost on my new DH rig to drop some weight.
    [size=3]Northstar 2008 Riding Crew[/size]

  2. #2
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    I heard that some of the carbon posts have snapped form the impact with your a$s and people have ended up with second but holes.

  3. #3
    e-misanthrope
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    Rectal bleeding is the new white - go for it.
    Don't waive your rights with your flags.

  4. #4
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    wrap a piece of masking tape around where you cut and youll be fine. Keeps it from splintering. but I wouldnt put it in a dh ouch!

  5. #5
    yaha ha
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    can you snap a carbon post? yes easily.
    Can you waste ALOT of money tobreak it? yes easily

  6. #6
    Takw/agranofsalt
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    Straight from Park Tools website: (I'm sure the same applies to carbon seatposts)

    NOTE FOR CARBON FIBER: For carbon fiber steering column, a finer 32 TPI blade is recommended. To minimize dust from the carbon, keep the blade wet. If you prefer to use a "diamond rod blade", it is possible to install washers to widen the guide slot of the SG-6. Another option is to use the outer blade as a guide. Hold the diamond blade against the outside steel face of the SG-6. Align the cut mark to this outside face, and press gently against the tool as you cut. Note that this will visually mar the tool. Use a fine emery cloth to finish the end.

  7. #7
    mtbr member
    Reputation: dowst's Avatar
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    Quote Originally Posted by Khemical
    Straight from Park Tools website: (I'm sure the same applies to carbon seatposts)

    NOTE FOR CARBON FIBER: For carbon fiber steering column, a finer 32 TPI blade is recommended. To minimize dust from the carbon, keep the blade wet. If you prefer to use a "diamond rod blade", it is possible to install washers to widen the guide slot of the SG-6. Another option is to use the outer blade as a guide. Hold the diamond blade against the outside steel face of the SG-6. Align the cut mark to this outside face, and press gently against the tool as you cut. Note that this will visually mar the tool. Use a fine emery cloth to finish the end.
    beat me to it. if you can cut a carbon steertube, you can cut a carbon seatpost.

    BE EXTREMELY CAREFUL and cut with VERY LITTLE PRESSURE. If the carbon begins to fray or come apart while your cutting, your hosed.

    I would recommend putting epoxy on the cut part of the seatpost, so that you don't risk the chance of the carbon weave unweaving itself later down the road.

  8. #8
    N* Bomber Crew
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    Ok these are pretty legit reasons not to get a Carbon Seat post.

    Sticking with the Thomson.
    [size=3]Northstar 2008 Riding Crew[/size]

  9. #9
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    Quote Originally Posted by NoBrakes!
    I heard that some of the carbon posts have snapped form the impact with your a$s and people have ended up with second but holes.
    I broke a carbon seatpost once. I bought a used carbon post (can't remember the brand now) at a swap and threw it on my single speed. It worked find for a while, and then one time I rode off the edge of the pavement onto a dirt lot - maybe a 3" drop - and heard a weird, deep pop as I landed. And then my seat very gently leaned back.

    I was really shocked when I hopped off my bike and saw a bunch of jagged, carbon spikes aimed at my bunghole. If things had gone a little differently... ouch. No more carbon posts for me. Felt pretty dumb for picking up a used carbon post too.

  10. #10
    mtbr member
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    I have carbon fiber bars and am anxiously waiting for them to explode.

  11. #11
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    I've just hit an all time record for highest imagined pain after reading this thread! LOL!
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    --Dan
    2005 IH Warrior Race
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