Seatpost Question
Moderator: robbosmans
With the new fad being an integrated post, I was thinking of the following.
I have a CAAD9 currently, and the only post I had laying about was a Thomson Elite 410mm. So right now, I've probably got 10CM that I could chop off it for weight savings.
Here's the question. Does having a longer post like that produce the same effect of having an ISP type frameset??
I have a CAAD9 currently, and the only post I had laying about was a Thomson Elite 410mm. So right now, I've probably got 10CM that I could chop off it for weight savings.
Here's the question. Does having a longer post like that produce the same effect of having an ISP type frameset??
In desperate moments, on the rivet, opening up my giant suitcase of courage, definitely not a climber but a big strong man..
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Not dumb at all. I thought one of the benefits of this was to produce a stiffer platform... or not so much?
In desperate moments, on the rivet, opening up my giant suitcase of courage, definitely not a climber but a big strong man..
The stiffness of the frame/post interface is only affected by the actual bit of the post which touches the inside of the seat tube, probably about 8-10cm in most double butted or CF frames. If you can be bothered you can probably see/feel where the step change in internal diameter is. Any post sticking out below this point is useless. Some frames/posts with poorer tolerancing may only contact properly over 1/2 of this length as the clamp will not take up the gap between the ID and OD all the way down to the diameter change.
So no, having a longer than needed seatpin won't give you the effect you think you'll get.
So no, having a longer than needed seatpin won't give you the effect you think you'll get.
Ah. That makes sense. I didn't even think of the fact that the tube lengths change.
Now... where did I put my hacksaw. That thing's gettin' chopped today!
Thanks for the replies!
Now... where did I put my hacksaw. That thing's gettin' chopped today!
Thanks for the replies!
In desperate moments, on the rivet, opening up my giant suitcase of courage, definitely not a climber but a big strong man..
Thanks...
I was going to measure the minimum insertion line from the bottom of the post to the line and leave one cm more than that distance when I chop.
I was going to measure the minimum insertion line from the bottom of the post to the line and leave one cm more than that distance when I chop.
In desperate moments, on the rivet, opening up my giant suitcase of courage, definitely not a climber but a big strong man..
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- Frankie - B
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A very good rule of thumb is to let the post extend one inch past the underside of the toptube and then cut what is left.
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