Seat post angles for tri

6 messages
27/11/2009 at 14:30
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.

27/11/2009 at 14:58
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.

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27/11/2009 at 20:36
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.
27/11/2009 at 22:13
As Hussler says be very careful!

Have a read of this, there is a lot to take in but it makes an interesting read: ... kefit.html

Then just for comparison have a look at the dimensions on the road bike here: ... 360037586/
Compared to the Tri bike here: ... 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

It seemed like a good idea at the time!!

Go Team Timmy
28/11/2009 at 13:14
...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!

Pain is just weakness leaving the body.

28/11/2009 at 19:25
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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