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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 09-14-10, 08:38 AM   #1
tallstevens
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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?
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Old 09-14-10, 09:04 AM   #2
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Doesn't anyone have a tape measure?. or a yardstick?
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Old 09-14-10, 09:14 AM   #3
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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.
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Old 09-14-10, 09:20 AM   #4
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What's the frame made of? steel likely 1 1/8th ..aluminum .. 1 1/4"
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Old 09-14-10, 10:06 AM   #5
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I am pretty sure it is an aluminum frame.
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Old 09-14-10, 10:20 AM   #6
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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?
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Old 09-14-10, 10:21 AM   #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.
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Old 09-14-10, 11:41 AM   #8
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Aka 1.125" 1.25" , 1.375".. inch and an eighth / quarter/ and three eighths.
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Old 09-14-10, 12:10 PM   #9
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Seatpost dia is 27.2
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Old 09-14-10, 12:27 PM   #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.
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Old 09-14-10, 12:29 PM   #11
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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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