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Old 08-14-07, 09:20 AM   #1
brianb
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Why does Specialized used set-back seatposts?

I recently bought a frame on ebay, it is the same one you see here

http://www.specialized.com/bc/SBCBkM...006&spid=21783

I am at the point of ordering a seatpost (thomson). I see that the bike is spec'd with a setback post, is this necessary because of the geometry or something, or would a straight post be ok on this frame? Thanks
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Old 08-14-07, 09:39 AM   #2
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It's just a fit thing. Setback seatpost just moves your weight backwards a bit. It's all a function of toptube length, seatpost geometry and stem length. From a technical point of view, sure you can run a straight post. From a fit point of view - that's a big "it depends".
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Old 08-14-07, 09:45 AM   #3
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A 'setback' thomson post is a bit misleading. Since the clamp design has zero offset to the post, a setback thomson post has about the same setback as most other brands 'regular' posts.

A regular thomson post (or any other zero offset clamp design) would theoretically put you forward about 20 mm.

But like GV27 said , its all about fit. Find the post position and height that gets you in the correct position as it relates to your pedals and go from there.
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Old 08-14-07, 09:49 AM   #4
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Plus don't forget the seat can be adjusted in either setup. So if you're running a setback post with the seat slid forward, you can go to a straight post no problem. And vice-versa.
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Old 08-14-07, 09:54 AM   #5
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Thomson found that by bending the post and using a zero offset seat clamp, it makes the overall package a little lighter than usinng a strait post and heavier offset clamp. My own measurements on my bikes show no difference in rider position.
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Old 08-14-07, 10:19 AM   #6
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Quote:
Originally Posted by born2bahick View Post
My own measurements on my bikes show no difference in rider position.
OIC - that took me a minute to figure out. You mean no difference between the Thomson setback design and "conventional" setback designs, right? Thought for a second you meant straight fs. setback and i was like "Whatchu talkin' 'bout, Willis?".
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Old 08-14-07, 11:01 AM   #7
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I mean the strait post (specialized) with offset clamp that came on my Epic. Compared to the Thomson masterpiece setback post that I put on it. There is no difference in rider position. I did the upgrade for the weight savings and the somewhat neater look.
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Old 08-14-07, 12:04 PM   #8
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Thanks folks. I ordered the setback. The incredible details about cycling minutia avaliable in the collective brains of this membership always amaze me.
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