Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    Kid A TurbineBlade's Avatar
    Join Date
    Aug 2009
    Location
    Alexandria, VA
    Posts
    1,778
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Rear brake "through the seat tube" routing issue

    Hi, I have an older mountain bike that has the rear brake cable routed through a narrow piece of plastic lining that sort of goes around the seat tube. I can feel a lot of friction in the braking and was wondering if there is a better solution for routing this cable? The little "tunnel" where the brake cable is routed is *almost large enough in dia to fit a pice of brake housing, but it's not quite enough.

    Anyone found a good solution to this? Ignore the Surly rear housing stop in the picture, it's just sitting there in case I just opt to run full housing back to it.

    Thanks,
    001.jpg002.jpg
    Cyclist, angler and aquarist

  2. #2
    Bianchi Goddess Bianchigirll's Avatar
    Join Date
    Apr 2009
    Location
    Camp Hill, PA
    My Bikes
    Too many to list here check my signature.
    Posts
    20,044
    Mentioned
    29 Post(s)
    Tagged
    1 Thread(s)
    I see you're experimenting with a housing stop hanging from the seatbinder. I always thought this was an OK method but never had much experience repaining 5 to 6+ yo bikes with them. I assume you tried simply replacing the plastic liner? I believe that is the same stuff they use/used to cover the cable between the housing stops and should not be too hard to source at your LBS

    I think I see a paint chip or nick you don't have a dent or kink in the tube do you?





    What kind of bike is that?
    Bianchis '87 Sport SX, '90 Proto (2), '91 Boarala 'cross, '93 Project 3, '88 Trofeo, '86 Volpe, '89 Axis, '79 Mixte SOLD, '99 Mega Pro XL Ti, '97 Ti Megatube, , '90 something Vento 603,

    Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '86 Bertoni (sold), '09 Motobecane SS, '98 Hetchins M.O., '09 K2 Mainframe, '89 Trek 2000, '?? Jane Doe (still on the drawing board), '90ish Haro Escape

  3. #3
    Senior Member
    Join Date
    Oct 2007
    Location
    West Yorkshire, United Kingdom
    Posts
    3,267
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    That routing is doing the same job as a cable hanger would, you could get a cable hanger which sits on the shaft of the seat post QR to elimiate this (the Surly device looks to be this? fuzzy photo so hard to tell what it's doing), but you still need somthing there to guide the cable.

  4. #4
    Spinning @ 33 RPM Glynis27's Avatar
    Join Date
    Aug 2007
    Location
    NE Ohio
    My Bikes
    '89 Fuji Saratoga, '97 Schwinn Mesa SS, '07 Felt F1X, '10 Transition TransAM, '11 Soma Analog SS
    Posts
    746
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    What condition is the plastic tube in? Slide it out of the metal guide to look. How about the brake cable? Any kinks or corrosion? Do you put any lube in there?
    1989 Fuji Saratoga
    1997 Schwinn Mesa SS
    2007 Felt F1X
    2008 Transition Vagrant SOLD!
    2010 Transition TransAM
    2011 Soma Analog SS

  5. #5
    Quirky Grifter LesterOfPuppets's Avatar
    Join Date
    Sep 2008
    Location
    Vancouver, USA
    My Bikes
    My War
    Posts
    20,065
    Mentioned
    43 Post(s)
    Tagged
    7 Thread(s)
    The angle the cable's entering the seatpost guide from isn't very pretty. Cable will saw through that black liner after a handful of brake applications. You could just run housing all the way back to that silver cable stop you have. Zip tie housing to top tube.

    Something about current setup doesn't seem to be as intended by frame designers.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

  6. #6
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    40,043
    Mentioned
    27 Post(s)
    Tagged
    0 Thread(s)
    Did a through the seatpost cable hanger on my AlAn Cross Super, in the 80's
    my [late] father , a retired Machinist, made an internal roller that fit inside
    my 25.0 Campag super record seat post.. .. came out clean looking.
    worked perfectly.

    sold off the frame, taller rider didn't need my seat post.

  7. #7
    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
    20,651
    Mentioned
    46 Post(s)
    Tagged
    1 Thread(s)
    The small braze on noodle is a nice system and doubles as the hanger saving you an extra part. However this builder flubbed by making it too short to five a fair lead to the brake.

    No matter what you do, there's a bend involved going from the top tube to the brake, but the short noodles end means causes a sharp corner which is probably the problem.

    . Since you already have a liner there's obviously enough room. You can buy teflon or High density poly ethylene HDPE tubing, and cut a short length as a liner. Make sure there's enough hanging out the back end to make a fair lead to the brake, otherwise the cable will be sawing at the sharp bend at the end of the noodle, which is probably the problem.

    You might try threading 4mm index housing or a brake housing stripped of the outer cover as a liner. The added stiffness will help soften the last bend into a gentle curve.
    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.

Posting Permissions

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