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Seat post angles for tri

Ok, so heres a question for the guys who know bike fitting and angles etc, out of general interest.

I'm on a road bike and have spotted a seat post that "positions the saddle further forward, in the same way as a steeper seat tube angle, making for a more powerful aerodynamic position. This unique Carbon seatpost effectively changes a 73 degree seat tube angle frame to 78 degree to move the rider forward by up to 38 mm"

So besides being a lot of money for a seatpost, is this actually going to work, assuming you get the rest of the setup right? And are we talking about better aero position (as I though that was mainly down to position on the bars), or being in a position which saves the legs a bit more for the run afterwards?

Just a thought as I cant see myself getting a tri bike for a while longer *sigh*. Thanks.


  • I've looked at one of these previously thinking they would be the easy answer to not buying a Tri bike, but never actually splashed the cash to get one. Someone else has said that you can just turn your existing seatpost around, and then re-install the saddle, to a similar effect, at no cost.
  • hussler.hussler. Posts: 390
    Be careful changing seat post angle on a road bike too much..... they have a different fork angle, top tube length, wheelbase etc..... it may completely throw the handling of the bike out and you may injure yourself too.
  • ZacniciZacnici Posts: 1,385
    As Hussler says be very careful!

    Have a read of this, there is a lot to take in but it makes an interesting read:
    http://www.slowtwitch.com/mainheadings/ ... kefit.html

    Then just for comparison have a look at the dimensions on the road bike here:
    http://www.wiggle.co.uk/p/cycle/7/Focus ... 360037586/
    Compared to the Tri bike here:
    http://www.wiggle.co.uk/p/cycle/7/Focus ... 360037593/

    Bit unscientific but you get the drift

    My own two penneth (for those old enough to remember that expression) go Tri bike if you can afford - lets face it not many of us can - we're addicted - more bling please
  • nivaghnivagh Posts: 595
    ...also 38mm is a big forward movement - you may need to buy a new stem as you are effectively shortening your top tube by the same amount!
  • BmanBman Posts: 442
    Thanks guys, yeah these are all the things I was thinking I would have to consider. No quick and easy solution to these kinda things I guess. Time to forget the gear for a while and focus on the engine methinks!
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