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what size seatposts does a bridgestione keirin frame use

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what size seatposts does a bridgestione keirin frame use

Old 09-21-06, 05:12 PM
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sore taint
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what size seatposts does a bridgestione keirin frame use

I don't want to try to jam my miche seat post in a frame it doesn't fit
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Old 09-21-06, 05:13 PM
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depends on the frame. 27.2's pretty common.
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Old 09-21-06, 05:15 PM
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mine is 27.0

I'm pretty sure the only keirin sizes are 28.6, 27.0, and 27.2
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Old 09-21-06, 05:17 PM
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so should I try to jam my 27.2 in there
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Old 09-21-06, 05:17 PM
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jam it in. if it doesn't fit it won't go in, and then you'll know. No biggie. 27.2 is the most common size.
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Old 09-21-06, 05:28 PM
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what kind of tubing is it?
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Old 09-21-06, 05:33 PM
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seem s to be a 27. so close yet soooooooooo far away. any one wanna buy a silver miche supertype ? 27.2
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Old 09-21-06, 05:37 PM
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Shop have a tool to determine what size seatpost you need.
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Old 09-21-06, 06:21 PM
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Called a caliper?
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Old 09-21-06, 07:24 PM
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Originally Posted by sore taint
I don't want to try to jam my miche seat post in a frame it doesn't fit
26.8, 27.0, or 27.2 are for keirin - ruler and squint and you'll be right or off for a seatless ride to your LBS for perfection!
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Old 09-21-06, 09:49 PM
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caliper isn't always right due to human error(read: measuring in not the exactly center of the tube) we have a cool little tool to gauge the tube, it steps up, i think by 0.2mm and when it stops you know what size the tube is...so bring it in to a shop
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Old 09-21-06, 10:30 PM
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Originally Posted by thebigmrT
caliper isn't always right due to human error(read: measuring in not the exactly center of the tube) we have a cool little tool to gauge the tube, it steps up, i think by 0.2mm and when it stops you know what size the tube is...so bring it in to a shop
what's that tool called? most shops just have regular (no matter how fancy and nice) calipers.
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Old 09-22-06, 12:32 AM
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tubing tubing tubing tubing tubing what kind of tubing
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Old 09-22-06, 12:40 AM
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Originally Posted by trons
tubing tubing tubing tubing tubing what kind of tubing
i was about to ask the same thing. does anyone know what NJS approved tubing would have a seat tube with a 26.8 ID?
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Old 09-22-06, 08:23 AM
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i actually have no idea, i just always call it the seat tube deal, when im in today i'll see if anyone knows a name for it
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Old 09-22-06, 08:55 AM
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I have had only 27.0 and 27.2 frames.

S/F,
CEYA!
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Old 09-22-06, 09:37 AM
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Same here, although oddly I've had both 27.0 and 27.2 posts in the same tubeset (Ishiwata 019)
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Old 09-22-06, 11:25 AM
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Standard post diameter is 27.2. Seat tubes are seldom perfectly round in the vicinity of the seat lug, so it may not feel like a fit for a 27.2 but only because the tubing is slightly ovalized. That doesn't mean that you want to put in a smaller post, because it will loosen up or the seatpost clamp will overclamp and never fit right. You can also have paint, flux, some brazing metal, or whatever that affects the inside diameter. If a 27.2 doesn't fit properly, you may want to have a shop run a flexhone through the seat tube just to clean it out and remove any burs -- that can make the difference to give you a very clean fit. A builder like Nagasawa uses one before his frame ships, but other frames -- especially those produced in larger numbers -- don't necessarily get this treatment.

If you go to thicker tubing sets they jump up in wall thickness by 0.1 mm, which of course means your inner diameter jumps by 0.2 mm increments. However, seat tube sets typically don't thicken up at the top, just so you can standardize on a 27.2. Now occasionally a builder will use another tube (not the one intended for a seat tube) and will have butting at the top end that drops down in inner diameter slightly. There are also unorthodox tubing sets or loose tubes that are used from time to time (because they're available, because a frame needs extremely long or short tubes, because someone wants to use them up, or because someone had a very long tube or very short tube that wasn't trimmed within the specified range), and they can create odd seat post diameters as well.

If your frame was built with a standard tubing set and was cut within the specs of the correct designated seat tube, it should be a 27.2. I've probably seen a couple hundred full NJS keirin frames up close and had to borrow a seatpost and saddle from time to time. I've found a 27.0 seatpost once; all the rest were 27.2. Hope that helps.
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Old 09-22-06, 11:27 AM
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27.0...HOLLA! That was my fly ride and then the Rootbeer one was 27.2.
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Old 09-22-06, 02:09 PM
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Originally Posted by Ceya
I have had only 27.0 and 27.2 frames.

S/F,
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Old 09-22-06, 04:19 PM
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If your frame was built with a standard tubing set and was cut within the specs of the correct designated seat tube, it should be a 27.2. I've probably seen a couple hundred full NJS keirin frames up close and had to borrow a seatpost and saddle from time to time. I've found a 27.0 seatpost once; all the rest were 27.2. Hope that helps.[/QUOTE]
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Old 09-22-06, 04:32 PM
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Originally Posted by thebigmrT
caliper isn't always right due to human error(read: measuring in not the exactly center of the tube) we have a cool little tool to gauge the tube, it steps up, i think by 0.2mm and when it stops you know what size the tube is...so bring it in to a shop
Yes, the neat step gauge makes sizing a seat tube so much easier. But a person who can not size a bike's seat tube ID with a set of calipers should not be allow to touch such an instrument. There was a name for these folks, it is "Shoemaker". (no offense to makers of shoes intended)

note; there was never anything that would bar a shoemaker from owning a track bike.
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Old 09-22-06, 04:40 PM
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Originally Posted by sore taint
If your frame was built with a standard tubing set and was cut within the specs of the correct designated seat tube, it should be a 27.2. I've probably seen a couple hundred full NJS keirin frames up close and had to borrow a seatpost and saddle from time to time. I've found a 27.0 seatpost once; all the rest were 27.2. Hope that helps.
[/QUOTE]



mess that 1rst one up. anyway.

that 27.2 seatpost is not fitting at ALL.blurrs, paint,even tried to spread it open with the trusty ol' screw driver so you can add one more to your list
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Old 09-22-06, 05:05 PM
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27.0 may be uncommon (?) , but have 1st hand proof positive.
Good luck
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Old 09-22-06, 07:00 PM
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of the ~15 bridgestones current listed on eframebank, two have the seattube listed as 27.0, the rest being 27.2. good luck.
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