Advertise on Bikeforums.net



User Tag List

Results 1 to 8 of 8
  1. #1
    Senior Member
    Join Date
    Sep 2008
    Location
    Sesame Street
    My Bikes
    Swobo Folsom, Diamond Back Master TG, Mongoose Alta, Huffy Daisy Tandem
    Posts
    270
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Importance of Brake vs. Derailleur Housing in Specific Instance

    I am in the midst of rebuilding an early 90s Diamond Back Master TG road bike. I have come to rebuilding the rear derailleur system. The bike is equipped with downtube shifters and the cable only had housing in a loop from the chainstay cable stop to the rear derailleur. This is the only bit I need. The rear shifter is selectable between indexed and friction. Frankly, is derailleur-specific housing absolutely necessary in this application or would brake housing suffice?

    I question the importance of derailleur housing in this application due to the slight movement of the derailleur and after reading somewhere about how the helical strands of derailleur housing really only come into play as reducing housing compression when in frequent-movement application, i.e., from a bar-end shifter to a downtube cable stop.

    Thanks in advance!

    Cheers
    Rex Kramer: Striker, listen, and you listen close: flying a plane is no different than riding a bicycle, just a lot harder to put baseball cards in the spokes.

    - Airplane!

    Quote Originally Posted by Phil_gretz View Post
    I don't know about style, because I live in the suburbs.

  2. #2
    Senior Member
    Join Date
    Feb 2009
    Posts
    4,149
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    Go with the der cable. It's not that expensive and it does take quite a bend at the rear.
    Never use der. cable with brakes. It is not meant to stand the compression.

  3. #3
    Real Men Ride Ordinaries fuzz2050's Avatar
    Join Date
    Sep 2008
    Posts
    3,648
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    for that little bit of cable, the leftover brake cable should do the job perfectly. Just make sure you get the length right. The fact that there is a bend there is not of major consequence, since it is for all intents and purposes a rather stationary bend, the radius isn't changing much as you shift throughout the cogs.

    Some older bikes just used a length of coiled spring without a plastic coating on that segment. It looks cool, and it works just as well, but it's completely unsealed.

  4. #4
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    Location
    St Peters, Missouri
    My Bikes
    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
    Posts
    24,005
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    If it was my bike I'd use the left over brake housing but I'd leave the shift cable a little long. That way, if it doesn't work, you can buy the "right" derailleur housing to use later. Leave the shift cable a bit on the long side so you have some extra to cut off if the end frays.

  5. #5
    Senior Member
    Join Date
    Jul 2005
    Posts
    3,194
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Using the brake cable will mean a sloppy fit for the der cable in the housing. Of course, you would be saving the $1.50-2.00 cost of a foot of new der cable. Logic thus dictates you use the brake cable. The savings are just too great to overlook. bk

  6. #6
    Senior Member
    Join Date
    Feb 2007
    Location
    Central CA
    My Bikes
    Fuji SST, Cotic Roadrat Tourer, Bianchi BASS Commuter Frankenbike
    Posts
    1,120
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    $2.00 at most, and after tax!

    Still, with just a 7(?)-speed rear and shifter set to friction mode, it might work just fine. I wouldn't do it with any new bike.

  7. #7
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    3,319
    Mentioned
    48 Post(s)
    Tagged
    0 Thread(s)
    Linear bundled wire housing came in with Index shifting, if you want it to Klick shift, that's the way to go..
    the top pulley float on Shimano index shifters allow a little mis allignment

    Coiled square wire housing was fine for both before that, when precise shifting was a skill rather than a gadget.

    Still use that stuff for Rohloff shifter cable sets because its got all the gear sequence selection in the hub.
    Last edited by fietsbob; 07-10-10 at 12:05 AM.

  8. #8
    Senior Member
    Join Date
    Sep 2008
    Location
    Sesame Street
    My Bikes
    Swobo Folsom, Diamond Back Master TG, Mongoose Alta, Huffy Daisy Tandem
    Posts
    270
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for all the replies, guys. I think I'll go ahead with the brake cable for the time being I was just looking for some other opinions.

    Cheers
    Rex Kramer: Striker, listen, and you listen close: flying a plane is no different than riding a bicycle, just a lot harder to put baseball cards in the spokes.

    - Airplane!

    Quote Originally Posted by Phil_gretz View Post
    I don't know about style, because I live in the suburbs.

Posting Permissions

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