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Seatpost – Effects of changing to a layback post.

Private JokerPrivate Joker Posts: 4
edited July 2008 in MTB workshop & tech

I have a 2005 Kona Dawg deluxe (size 18”), I’m just over 6’ 1”.

I currently have the standard in-line post that came with the bike and I have the saddle as far back as possible without going past the markers on the saddle rails.
I constantly find myself pushing my backside further back and slightly off the saddle when pedalling, I just feel a little cramped.

I would like to try a seatpost with 0.5” layback but I’m curious to how this will affect the weight distribution and my pedal stroke?

I’m guessing that manufacturers spec either an in-line post or layback with the weight distribution and pedal stroke (alignment?) in mind?

I’ve checked the geometry and the ETT of the 2005 18” Dawg is 23.9.

It’s been suggested that the frame may be a little small for me.



  • dave_hilldave_hill Posts: 3,877

    It’s been suggested that the frame may be a little small for me.


    I'd have to agree - I ride an 18" Giant VT and I'm right on the limit with it at a gnat's whisker under 6ft.

    A lay-back post will allow you to put your saddle further back and open up the cockpit a bit, but bear in mind that it will also throw your weight further back. if you do that there's the risk that the front wheel will want to lift more when climbing. Of course you could combat this by fitting a slightly longer stem, which would lengthen the cockpit even more. But then your weight would be further forward which would descending more exciting...
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  • I would not agree that the frame is too small, I would say get and try a layback post and see how you go. also may need to adjust shock pressures for sag if your weight is distributed differently.
  • i've just got a fsa k-forse post with an inch layback and have to say like you prior to fitting was always pushing my backside off the back of the saddle! but now its a lot more comfortable to ride, although i am now sitting on the saddle properly my inner bum muscles arnt half telling me so lol! but definately worth looking into!

    i usd to have a titec hell bent layback post but it was a bit too much layback! neede monkey arms to reach the bars with it loL!
    After all, I am Cornish!
    Cotic Soul, The bike of Legends!:wink: Yes, I Am a bike tart! ... 1#16297481
  • My understanding is that from a pedalling point of view In general terms, the further back your saddle, the more you'll bring your hamstrings into play. If you're only either doing short time trials on a road bike, or climbing steep hills on the mtb and therefore just want max power from your quads then a more forward position may be prefered. However the most effecient position will be slightly back - finding the balance of a position that lets you use some hamstring but not loose to much power from your quads.

    If you feel cramp in terms of reach (i.e. your problem isnt in your pedal stroke), then try a longer stem. But whichever, the best advice is usually to sort out your saddle position first, then work on the reach to the bars with the stem.

    Of course, if you're doing loads of downhill and dont care about pedalling, then the above is worthless b*****ks :)
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