Saddle Rail Position on Clamp

Marvinman Posts: 126
edited July 2016 in Workshop
HI, I am going through a bike fit at the moment for a new steed, my previous bike (and me) having been damaged in a crash. My previous bike had a setback seatpost with a 25mm setback with the saddle pretty much clamped in the centre of the rails.

As part of the process the suggestion is that I move my saddle forward by 15mm, with the possibility in time to moving forward by around 20mm. Its subject to comfort over time and testing, but on testing thus far it has proven to be more comfortable than the previous setup.

The fitter is on about the importance of clamping the saddle in the middle of the rails, but I understand that my saddle (a Fizik Aliante VS) has a range on its rails for this type of adjustment?

The issues I am struggling with are:

- What if any difference/problem arises from not clamping the saddle in the middle of the rails?
- If I use an inline post with the saddle set back on its rails slightly presumably this is no real issue?
- Or should I stick to getting a a -10mm (or thereabouts) setback post clamping the saddle rail as close to the centre point as possible?



  • mrb123
    mrb123 Posts: 4,721
    The saddle rails are designed as they are to give a range of adjustment. So long as your set up on the rails isn't too extreme then there shouldn't be any problem, certainly not worth buying a new seatpost.

    Have a look at Valverde's saddle here - not really in the middle of the rails I would say! ... ad-cf-slx/
  • Marvinman
    Marvinman Posts: 126
    Yes that was what I thought, he just keeps banging on about the saddle clamp needing to be on the middle of the rails.

  • marcusjb
    marcusjb Posts: 2,412
    Very odd! In the ideal world, yes, maybe it should be in the centre, certainly aesthetically more pleasing, and possibly gives better comfort by having similar compliance fore and aft (though whether that compliance is coming from the rails or the seat is open to debate).

    As above, rails are there to provide the range of movement fore and aft.

    Some saddles on some of my bikes are at the front of the rails, some are at the back and some are at the middle.

    It really doesn't matter so long as the saddle is in the right place for you.