Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    Senior Member
    Join Date
    Aug 2010
    Location
    Utah
    My Bikes
    Trek Mondane 5.9,Scott CR1 Pro, Kona Jake The Snake, LeMond Zurich, Raleigh Mojave 8.0
    Posts
    1,273
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Spreading saddle rails??

    Trying to get a tad more aft positioning at of Velo Orange saddle. The rails move in slightly stopping me from getting the saddle far enough aft. Anyone every successfully spread/bend rails a bit to allow more positioning.

    The saddle is being used on a 2011 Trek 5.9 frame and I'm limited (as best I can tell) with using the Trek seat cap with only 20mm of rear offset.

    thanks
    Steel is real.... cheap and comfy!
    2000 LeMond Zurich, 2003 Kona Jake The Snake, 2008 Raleigh Mojave 8.0, 2009 Scott CR1 Pro, 2011 Trek 5.9,

  2. #2
    AEO
    AEO is offline
    Senior Member AEO's Avatar
    Join Date
    Jun 2007
    Location
    A Coffin Called Earth. or Toronto, ON
    My Bikes
    Bianchi, Miyata, Dahon, Rossin
    Posts
    12,245
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    nope, you can't do that.
    at least not unless you want to split the saddle in half.

    the only way to do it is to get a seatpost that has more setback to start with.
    The two cheaper ones are kalloy UNO w/ 30mm offset or VO grand cru w/ 32mm offset.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  3. #3
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    19,561
    Mentioned
    27 Post(s)
    Tagged
    1 Thread(s)
    You can't spread the rails, but if you only need a little bit more travel, you might be able to file away from the inside of the seatpost clamp at the front. This will allow the saddle to slide back a bit farther with the narrow section in the area you've opened up.

    The first generation Campagnolo seatposts (late 60s) had this feature. The saddle rail support had a semi-circular grove, but the inner wall was cut back about 10mm, so it still held top and bottom, but not to the inside.
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  4. #4
    Senior Member
    Join Date
    Aug 2010
    Location
    Utah
    My Bikes
    Trek Mondane 5.9,Scott CR1 Pro, Kona Jake The Snake, LeMond Zurich, Raleigh Mojave 8.0
    Posts
    1,273
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The problem is that this is a seat mast/cap setup. Does not take a standard seat post. The saddle mounts to the mast caps which fits over the mast. Don't think filing away part of a carbon fiber piece would be very safe.
    Steel is real.... cheap and comfy!
    2000 LeMond Zurich, 2003 Kona Jake The Snake, 2008 Raleigh Mojave 8.0, 2009 Scott CR1 Pro, 2011 Trek 5.9,

  5. #5
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    19,561
    Mentioned
    27 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by jamesdak View Post
    The problem is that this is a seat mast/cap setup. Does not take a standard seat post. The saddle mounts to the mast caps which fits over the mast. Don't think filing away part of a carbon fiber piece would be very safe.
    Yes, carbon isn't as user friendly as metal. You have to look at the construction and decide. You're removing very little, only the inside lip top and bottom, so if the supports cover a decent length of rail, you'll be OK. It also depends on how the carbon is wrapped, or whether it's a carbon reinforced molded piece.

    In any case the most you can gain by this method is probably 1/4" or so. Otherwise you have very few options because they probably don't make a different mast with more setback, or a setback mast head.

    Last resort, see a good fitter and review your total fit and position. Possibly a different saddle and/or change in the length of the stem might be the ticket.

    I'm not a total retro grouch, but I really hate that so many high end modern bikes have so little latitude for user fit adjustments. It's really bad when you have to scrap a frame to push the saddle back a bit.
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  6. #6
    bike whisperer Kimmo's Avatar
    Join Date
    Dec 2009
    Location
    Melbourne, Oz
    My Bikes
    copy/paste links: http://velospace.org/node/36949 http://velospace.org/node/47746 http://velospace.org/node/47747
    Posts
    6,786
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by jamesdak View Post
    The rails move in slightly stopping me from getting the saddle far enough aft.
    What, where the rails should still be parallel? On every seat I've seen, the rails bend in fairly sharply after that point...

    If so, it shouldn't take much work... bit of a head-scratcher figuring out how to apply the force though. Maybe a large bolt and nut that only just fits in between, unscrewed?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •