0 Layback Seatpost

[Pot Odds]

Went for a bike fit yesterday and its being suggested that i need to come a little further forward and that a 0 layback seat post is probably in order - sadly this cut the rest of the fit short.

No problem thinks I !

However i've now found out that due to having 9x7 oval carbon saddle rails on my specialized romin evo pro saddle this somewhat limits my choice due to most side clamping seat post mechanisms only accepting standard round saddle rails

Has anyone any experience of / recommendations for a carbon seat post with 0 layback which will take oval rails - would need to be a 31.6 diameter tube.

I guess one option is to change the saddle to the Romin Evo Expert that comes with standard 7mm round titanium rails and then have a greater choice of seatposts.

Cheers

PO

[Matt_N]

Most seat posts that clamp vertically will work with a carbon rail as they will be 7mm wide, 9mm is the vertical distance.

Most manufacturers also offer a carbon specific clamp, ie Thomson, Ritchey, Enve and Specialized themselves.

My Deda carbon post takes metal or carbon rails as it clamps vertically.

[ian996]

I have one of these:

https://www.condorcycles.com/products/condor-supre...

and one of these:

https://www.evanscycles.com/fsa-k-force-zero-setba...

Both should work with oval saddle rails (I'm using the same Romin saddle on the FSA one)

[Fluffsri]

Any of these suit your need?

http://www.ultimateuse.com/use-components/seatpost...

[scherzkeks]

Pot Odds said:

Went for a bike fit yesterday and its being suggested that i need to come a little further forward and that a 0 layback seat post is probably in order - sadly this cut the rest of the fit short.

No problem thinks I !

However i've now found out that due to having 9x7 oval carbon saddle rails on my specialized romin evo pro saddle this somewhat limits my choice due to most side clamping seat post mechanisms only accepting standard round saddle rails

Has anyone any experience of / recommendations for a carbon seat post with 0 layback which will take oval rails - would need to be a 31.6 diameter tube.

I guess one option is to change the saddle to the Romin Evo Expert that comes with standard 7mm round titanium rails and then have a greater choice of seatposts.

Cheers

PO

For a road bike? Unless the frame is too large, I would question the fit. Road bikes should always use setback posts, barring the above or some extreme morphology issue.

[ian996]

scherzkeks said:

Road bikes should always use setback posts....

Why? people come in a lot of different shapes and sizes and I wouldn't say your build would have to be extreme to warrant a zero offset seatpost.

By considering the use of a zero-offset , you are opening up a wider range of potentially well-fitting frames.

[scherzkeks]

ian996 said:

scherzkeks said:

Road bikes should always use setback posts....

Why? people come in a lot of different shapes and sizes and I wouldn't say your build would have to be extreme to warrant a zero offset seatpost.

By considering the use of a zero-offset , you are opening up a wider range of potentially well-fitting frames.

Because most frames are based on a standard stage race geometry developed over decades to accomodate a wide range of people and to balance the weight of the body over the bike in such a fashion that when the size is correct, a setback post is required.

You deleted the context in my original post as well: barring extreme morphology issues (very short femur), a correctly fitted road frame should use a setback post. There are very few exceptions.

[ian996]

scherzkeks said:

ian996 said:

scherzkeks said:

Road bikes should always use setback posts....

Why? people come in a lot of different shapes and sizes and I wouldn't say your build would have to be extreme to warrant a zero offset seatpost.

By considering the use of a zero-offset , you are opening up a wider range of potentially well-fitting frames.

Because most frames are based on a standard stage race geometry developed over decades to accomodate a wide range of people and to balance the weight of the body over the bike in such a fashion that when the size is correct, a setback post is required.

You deleted the context in my original post as well: barring extreme morphology issues (very short femur), a correctly fitted road frame should use a setback post. There are very few exceptions.

My point was, you don't have to have "extreme" morphology for a zero lay back post to widen the range of frames that will fit correctly.

If we all chose frames on the basis of which were most suitable for our build, I'd agree with you up to a point (and I'd agree more if you'd used a slightly more restrained term than "extreme") . However, a lot of people either don't know what geometry is required, or specifically want a particular brand/model. In which case , If the correct balance on a given frame can be best achieved using a zero layback post , that is the correct post for your frame/morphology combination.

It's not the biggest deal in the world, but bike fit is a very individual thing and I would suggest that the first thing that should be left at the door of the bike fit studio is any kind of assumption, and the idea that a zero layback post is "wrong" for a roadbike sounds a little like dogma.