Advertise on Bikeforums.net



User Tag List

Results 1 to 8 of 8
  1. #1
    Senior Member mrblue's Avatar
    Join Date
    Jul 2014
    Location
    San Francisco, CA
    My Bikes
    2013 Cinelli Vigorelli; 2014 Cinelli Experience; 2000 LeMond Tourmalet; 2006 Motobecane Record
    Posts
    130
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)

    Two Barrel Adjusters?

    I am very much a novice when it comes to derailleurs. As a matter of fact that is why I just bought a used road off craigslist--so that I can learn how to maintain/adjust derailleurs.

    Anyway...

    I am dealing with my rear derailleur at the moment. I understand cable tension is very important for smooth shifting, and said cable can be finely adjusted by turning the barrel adjuster on the rear derailleur, itself. Cool. However, I noticed I also have two barrel adjuster on the frame, on the upper portion of the down tube--one for the front derailleur and one for the rear derailleur. Why do I have two barrel adjusters for the rear derailleur (one on the frame and one on the derailleur) and which one do I use to make adjustments? Or do I use them in tandem somehow?

    Please advise.

    Thanks in advance.

  2. #2
    Senior Member Bill Kapaun's Avatar
    Join Date
    Feb 2007
    Location
    Mid Willamette Valley, Orygun
    My Bikes
    86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
    Posts
    7,357
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    My trigger shifters both have a barrel adjuster + the RDER has one.
    Some days it seems that a 1/2 turn one way or the other is useful for some reason. Maybe my aluminum frame bike has a different coefficient of expansion than the steel cable? and I can give it a tweak while riding.

    You didn't say WHAT bike you have.

    BTW, when setting up the rear, I have both adjusters about 1 turn out and then attach the cable.

  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
    22,393
    Mentioned
    65 Post(s)
    Tagged
    1 Thread(s)
    Either is fine, depending on your preference. I tend to adjust from the RD and leave the frame adjusters most of the way down but with room in either direction for on the bike fine tuning.

    There are adjusters on the frame because some RDs and most FDs don't have adjusters. Consider yourself better off than those whose frame lacks the adjusters (as many do these days), so you have no barrel adjuster for the FD. Two may not better than one, but it's far better than none.
    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
    johnliu@earthlink.net jyl's Avatar
    Join Date
    Aug 2006
    Location
    Portland OR
    My Bikes
    61 Bianchi Specialissima 71 Peugeot G50 7? P'geot PX10 74 Raleigh GranSport 75 P'geot UO8 78? Raleigh Team Pro 82 P'geot PSV 86 P'geot PX 91 Bridgestone MB0 92 B'stone XO1 97 Rans VRex 92 Cannondale R1000 94 B'stone MB5 97 Vitus 997
    Posts
    4,298
    Mentioned
    58 Post(s)
    Tagged
    0 Thread(s)
    Also it is hard to reach the derailleur-mounted adjuster while riding . . .

    I see that newer bikes with internal cable routing sometimes have barrel adjusters inline with the cable housing.
    Your signature contains too many lines and must be shortened. You may only have up to 2 line(s). Long text may have been implicitly wrapped, causing it to be

  5. #5
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    3,097
    Mentioned
    44 Post(s)
    Tagged
    0 Thread(s)
    the one on the RD itself comes with the RD, the shifter may have one of its own ..

    On the repair stand. I prefer the one on the RD itself
    so I am right there to watch the effect turning the adjuster has on locating the pulley under the cogs .

    Now some RD have None , then to synch Indexing, you need one somewhere else.

    with Friction shifting you really dont need any.

  6. #6
    Andrew R Stewart Andrew R Stewart's Avatar
    Join Date
    Feb 2012
    Location
    Rochester, NY
    My Bikes
    Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder
    Posts
    3,712
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Pity the rider who has indexed front shifting and NO adjuster...

    Don't forget to lube the adjuster's threading. I've seen WAY to many that are frozen in their stops. Andy.

  7. #7
    Senior Member
    Join Date
    Jun 2014
    Location
    Dayton OH
    My Bikes
    2013 Trek One Series
    Posts
    95
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have 3 for the rear and 2 for the front.

    I don't like the adjuster on the down tube so I put in a inline barrel adjuster on the cable right next to the shifter. I can easily adjust those and it is smooth adjustment, where the one on the down tube adjusts just like the rear mech with that little bump to hold it's spot, which I really don't like having to always turn one "click", sometimes I just need it to be a little in the middle of that.

    The one on the frame is for you to easily adjust while riding and should be able to fine tune(as much as those allow anyway.)

  8. #8
    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
    22,393
    Mentioned
    65 Post(s)
    Tagged
    1 Thread(s)
    Figures that a van Cleve would have 3 of something that most of us have only one of (or none or two).
    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
  •