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  1. #1
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    Seat Post Clamp Size

    Hello,

    I am trying to find out the size of a seat post clamp for a Specialized Globe Sport. The tightening latch on mine broke so I need to replace the clamp. Do anyone know what size this particular bike uses?

  2. #2
    coprolite fietsbob's Avatar
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    Doesn't anyone have a tape measure?. or a yardstick?

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    Yeah that would be ideal, but I am about 200 miles away from the bike.
    I was about to place an order for one online and figured I'd ask if anyone happened to know. Guess i can just wait until I get home to measure it.

  4. #4
    coprolite fietsbob's Avatar
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    What's the frame made of? steel likely 1 1/8th ..aluminum .. 1 1/4"

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    I am pretty sure it is an aluminum frame.

  6. #6
    My own worst nightmare
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    I've had two aluminum road frames with two different sizes of seatpost and binder. My '03 Raleigh Capri had a 27.2mm seatpost and took a 31.8 binder. It's replacement, an '08 Raleigh Grand Prix, takes a 31.6 seatpost and a 34.9 binder. Do you know offhand the seatpost diameter?

  7. #7
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    Most modern seattubes are built to the following 3 sizes 28.6mm, 31.8mm, and 34.9mm. Take off your current clamp and see if there are any stampings inside.

  8. #8
    coprolite fietsbob's Avatar
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    Aka 1.125" 1.25" , 1.375".. inch and an eighth / quarter/ and three eighths.

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    Seatpost dia is 27.2

  10. #10
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    Quote Originally Posted by tallstevens View Post
    Seatpost dia is 27.2
    In that case the seattube is most likely 31.8mm.

  11. #11
    coprolite fietsbob's Avatar
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    31.8 is probably OK, If no shims are inserted to use a larger ID tube.

    roughly a 2.3mm wall thickness tube.


    you can always return / exchange if the guess is off..
    Last edited by fietsbob; 09-14-10 at 12:38 PM.

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