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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 01-24-07, 06:16 PM   #1
OrgFarmCY
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9 1/2 inches of exposed seatpost

Bad Idea?

--Aaron
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Old 01-24-07, 06:17 PM   #2
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LOA of seatpost? Frame make?
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Old 01-24-07, 06:21 PM   #3
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It's an old frame a friend has. I happen to like it alot, but it has a short ST. It has a perfect top tube length, but the seat tube is about 5 cm shorter than it should be.

EDIT: This is a picture of my frame fit, is that measurement to the top of the seatpost, or top of the saddle?

If it's saddle, that would knock it down to 7 1/2 inches of exposed seatpost


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Old 01-24-07, 06:23 PM   #4
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If you can get the bars high enough and have a decent seatpost that was meant to extend that far you're fine.
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Old 01-24-07, 06:29 PM   #5
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Originally Posted by OrgFarmCY
My road bike fit has me at somewhere around 2 cm of exposed post

2cm exposed post? whaa?
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Old 01-24-07, 06:31 PM   #6
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Crappy math, I posted a picture of the bike fit I got at Providence bike.

--Aaron
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Old 01-24-07, 06:46 PM   #7
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Originally Posted by OrgFarmCY
Bad Idea?

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it depends how much post is in the seat tube. if you've only got an inch in the seat tube, you risk ovalizing it or worse, ie having that mf wrench out of there while you're riding. there should be a line (i call it a guideline) on the seat post that says minimum insertion or something like that, but you can usually get away with raising it another inch or so. but if you're a real clydesdale or have a super slack seat tube angle, i woiuldn't risking funking around too much.
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Old 01-24-07, 10:43 PM   #8
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As long as you have enough seat post in the frame I think it's totally fine. I see 350mm (~13.5 inches) seat posts on nashbar all the time. Assuming the minimum insertion mark is around 100mm, that gives you almost 10 inches to play around with. Run some mtb riser bars on it. Post pics.
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Old 01-24-07, 10:56 PM   #9
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Pervert.
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Old 01-24-07, 11:03 PM   #10
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my mtb has a salsa seatpost that sticks out about a foot.
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Old 01-24-07, 11:43 PM   #11
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I don't like it, but quite a few MTB manufacturers have gone to really short seat tubes lately, resulting in huge seat post requirements. People seem to be getting by just fine with them though.




Personally, I think this is just a ploy to minimize frame weight for the weight-concious crowd.
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Old 01-25-07, 12:33 AM   #12
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I don't like it, but quite a few MTB manufacturers have gone to really short seat tubes lately, resulting in huge seat post requirements. People seem to be getting by just fine with them though.




Personally, I think this is just a ploy to minimize frame weight for the weight-concious crowd.
It looks to me like this style increases hub-to-crank stiffness but gives a softer ride for your butt. Not sure if it ends up heavier or lighter though...
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Old 01-25-07, 02:13 AM   #13
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As long as you have the post inserted above the minimum insertion, your only issue would be a pretty substantial saddle to bar drop.
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Old 01-25-07, 05:55 AM   #14
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The rule of thumb is to have the post inserted below the intersection of the TT & the ST, minimum. Clear the TT and you should be fine.
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Old 01-25-07, 10:40 AM   #15
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i know plenty about 9 1/2 inches getting exposed, but none about this "minimum insertion". anyways, lets get back to bike talk.
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Old 01-25-07, 11:50 AM   #16
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i know plenty about 9 1/2 inches getting exposed, but none about this "minimum insertion". anyways, lets get back to bike talk.
+1. 9 1/2 inches of anything is always good.
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Old 01-25-07, 03:16 PM   #17
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i know plenty about 9 1/2 inches getting exposed, but none about this "minimum insertion". anyways, lets get back to bike talk.
<peter griffin> COUNT IT! </peter griffin>
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Old 01-25-07, 04:58 PM   #18
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i don't wanna brag or nothing.. but my seatpost is ~13 in

(old centurion with easton ea 50 seatpost, no issues yet)
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Old 01-25-07, 05:15 PM   #19
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Quote:
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i know plenty about 9 1/2 inches getting exposed, but none about this "minimum insertion". anyways, lets get back to bike talk.
I was wondering how long it would take until somebody mentioned that
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