How much Seat Post can I cut from this?

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McGilli
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Joined: Sun Jun 07, 2015 6:57 pm

by McGilli

Sorry if this has been talked about - couldn't find in search - please help me out and we can then let this thread fade away :)


I have a 400mm seat post.

I have marked my post at where it comes out of the clamp - properly adjusted to my saddle height.

Below the clamp - there is 200mm of post in there.

How much - from a weenie point of view - can I chop off safely?

I am a lightweight - weighing 135lbs.

Or is there a general rule of thumb? Like the post must reach just below the top tube, or must have 70mm of post in there etc... ?

Thanks so much...

by Weenie


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PDK
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Joined: Sat Jul 04, 2015 6:26 pm

by PDK

Every seatpost I've owned has had minimum insertion marking on it

So whatever distance than "Max height" marking is from the bottom of the seatpost, that is how much must be inside the frame

ricey155
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Joined: Mon Feb 25, 2013 11:10 am

by ricey155

Saved me asking the same question :-) #Bookmarked

McGilli
Posts: 373
Joined: Sun Jun 07, 2015 6:57 pm

by McGilli

PDK wrote:Every seatpost I've owned has had minimum insertion marking on it

So whatever distance than "Max height" marking is from the bottom of the seatpost, that is how much must be inside the frame



Awesome - simple - thanks.

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prendrefeu
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by prendrefeu

Yes, but not all seatposts have that marking, and not all situations are the same.

A general rule of thumb would be your seat-post should extend at least 2cm (or so) below the lower edge of your top tube's junction with your seat-tube.
Just a general rule of thumb for safe practices in WW-ism.
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aronjancso
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by aronjancso

I'm around the same weight and what I did was cutting at an angle (front of seatpost gets more stress than back), so front is 2 cm below bottom of the top tube, cut angle is around 45°, even thinned out the end a bit, since the end is exposed to much less stress than the clamp area. So I guess you can save some serious grams there.

by Weenie


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