Advertise on Bikeforums.net



User Tag List

Results 1 to 22 of 22
  1. #1
    Junior Member
    Join Date
    Aug 2007
    Posts
    6
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Shimano UN54 and UN72 alternatives

    I'm looking for a 68x115 shimano bottom bracket and the UN54 appears to be my only option I can find. Can anybody suggest other bottom brackets I could use? I'm not a fan of the plastic cup on the non-drivetrain side, so I'm trying to find something more like the UN72's alloy cup on the non-drive side.

    Help me out?

  2. #2
    Senior Member Grand Bois's Avatar
    Join Date
    Mar 2005
    Location
    Pinole, CA, USA
    Posts
    15,230
    Mentioned
    10 Post(s)
    Tagged
    0 Thread(s)
    Miche Primato. It installs just like a Phil Wood. There's nothing wrong with that plastic ring on the Shimano, though. It's plastic to prevent creaking. I've never had one break.

  3. #3
    Tell them I hate them Peedtm's Avatar
    Join Date
    Oct 2006
    Location
    Boise, ID
    My Bikes
    Specialized Allez Epic '91, IRO Mark V Pro, Schwinn Traveler
    Posts
    939
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    will the metal cup from the un72 fit? See a bike shop, they'll let you check it out to measure, and will probably have an extra metal cup to sell you cheap.

  4. #4
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,295
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by goggins View Post
    I'm looking for a 68x115 shimano bottom bracket and the UN54 appears to be my only option I can find. Can anybody suggest other bottom brackets I could use? I'm not a fan of the plastic cup on the non-drivetrain side, so I'm trying to find something more like the UN72's alloy cup on the non-drive side.

    Help me out?
    There's no logical reason to avoid the plastic bb cups if you use the appropriate torque on it. They are better than the metal cups in that it doesn't creak.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  5. #5
    Junior Member
    Join Date
    Aug 2007
    Posts
    6
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Dirtdrop View Post
    Miche Primato. It installs just like a Phil Wood. There's nothing wrong with that plastic ring on the Shimano, though. It's plastic to prevent creaking. I've never had one break.
    See, I have pretty much the same BB on my bike now, and I think the ring is what's causing the creaking on the non-drive side. It's driving me bonkers.

  6. #6
    Senior Member
    Join Date
    Sep 2005
    Location
    Michigan
    My Bikes
    Trek 730, Bike Friday NWT, Brompton M6R, Trek 830, Dahon HAT 060, ...
    Posts
    1,427
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Dirtdrop View Post
    There's nothing wrong with that plastic ring on the Shimano, though. It's plastic to prevent creaking. I've never had one break.
    And mine has cracked. I have never adjusted the cups on a new bike and noticed the crack when it became apparent the BB did not hold as tightly as it should. I have since avoided plastic for holding a BB.

    Otherwise, xxcycle:

    http://www.xxcycle.com/index.php

    has Stronglight and Token BBs.

  7. #7
    Senior Member
    Join Date
    Dec 2005
    Location
    Charlottesville, Virginia
    My Bikes
    Dawes Kalahari, Puch Prima Super Sport, Graham Weigh 853
    Posts
    1,990
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    How about the Tange ones that IRD sell?
    http://www.interlocracing.com/bbs.html

  8. #8
    A little North of Hell
    Join Date
    Mar 2006
    Posts
    4,354
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    grease is the word!

    did you grease the inside of the plastic cup?
    [SIGPIC][/SIGPIC]
    XXXI

  9. #9
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,295
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by 2_i View Post
    And mine has cracked.
    And the only reason it would crack is because of improper installation, overtorque.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  10. #10
    Senior Member
    Join Date
    Sep 2005
    Location
    Michigan
    My Bikes
    Trek 730, Bike Friday NWT, Brompton M6R, Trek 830, Dahon HAT 060, ...
    Posts
    1,427
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by operator View Post
    And the only reason it would crack is because of improper installation, overtorque.
    Sure, but it is also an issue of how much tolerance is left for error and also the possibility of part aging. The material should be, of course, best softer than the the shell, but it defeats me why Shimano might make one side of plastic while the drive side out of steel. I live happily with both sides out of alu and really have no interest of testing how many screwings and unscrewings the plastic could live through.

  11. #11
    Your mom
    Join Date
    Aug 2006
    Posts
    2,546
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I don't like the plastic cups either and have cracked several, but all have been my error. Once installed, they have been problem-free.

  12. #12
    Senior Member
    Join Date
    Sep 2007
    Posts
    355
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Could somebody write down the proper procedure for installing a Shimano BB with a plastic cup? I'm about to install one, but all these reports about cracked cups make me nervous.

    I take it the threads in the BB should be free of dirt and rust, and slightly greased. Do I first screw in the plastic side, and then the drive side? Tips are appreciated.

  13. #13
    Senior Member Ziemas's Avatar
    Join Date
    Nov 2004
    Location
    Riga, Latvia
    Posts
    10,069
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

  14. #14
    Since 1938... JunkYardBike's Avatar
    Join Date
    Aug 2006
    Location
    Northwestern NJ
    Posts
    6,209
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by dizzy101 View Post
    Could somebody write down the proper procedure for installing a Shimano BB with a plastic cup? I'm about to install one, but all these reports about cracked cups make me nervous.

    I take it the threads in the BB should be free of dirt and rust, and slightly greased. Do I first screw in the plastic side, and then the drive side? Tips are appreciated.
    Driveside first, greased, good and tight. Non-drive side, greased, just snug it down. I've cracked a couple myself. On my search for compatible replacement cups (not an easy task, as the sizing on these things are not standard, it seems) I had several shop mechanics tell me just to snug it down.

  15. #15
    Newbie
    Join Date
    Sep 2011
    Location
    Montreal
    Posts
    1
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I am also looking for alternatives to the plastic cups. Any suggestions? I need to to replace a Shimano UN-54 (68x118mm) but I want to try something else.

  16. #16
    another retro grouch Mr IGH's Avatar
    Join Date
    Apr 2009
    Location
    Front Range, CO
    Posts
    2,579
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by goggins View Post
    ... I'm not a fan of the plastic cup on the non-drivetrain side....
    You like that creaking sound on every pedal stroke ?

  17. #17
    Senior Member
    Join Date
    Nov 2010
    Location
    River City, OR
    Posts
    569
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Davidd419 View Post
    I am also looking for alternatives to the plastic cups. Any suggestions? I need to to replace a Shimano UN-54 (68x118mm) but I want to try something else.
    How 'bout this? http://www.universalcycles.com/shopp...3&category=347

  18. #18
    Senior Member
    Join Date
    Aug 2007
    Location
    NorCal
    My Bikes
    2009 Surly Cross Check Frankenbike
    Posts
    513
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Velo-Orange bottom brackets are very nice. Lighter than Shimano and a hollow spindle so you can use a skewer to hold the tool on while you install it.

  19. #19
    Senior Member
    Join Date
    Sep 2007
    Location
    Gaseous Cloud around Uranus
    Posts
    3,346
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    How about a UN 55, I believe it has an alloy cup instead of plastic.
    Everything should be as simple as possible...But not more so.---Albert Einstein

  20. #20
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    39,990
    Mentioned
    27 Post(s)
    Tagged
    0 Thread(s)
    QBP has an 'Up Cup', they got it made in aluminum,
    it's an aftermarket buy to replace the plastic ones
    seen here :http://www.universalcycles.com/shopp...&category=2634
    Last edited by fietsbob; 12-07-11 at 04:08 PM.

  21. #21
    Senior Member
    Join Date
    Sep 2005
    Location
    Michigan
    My Bikes
    Trek 730, Bike Friday NWT, Brompton M6R, Trek 830, Dahon HAT 060, ...
    Posts
    1,427
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fietsbob View Post
    QBP has an 'Up Cup', they got it made in aluminum,
    it's an aftermarket buy to replace the plastic ones
    $20!? In the past, when I was looking for a metal cup for a Shimano BB, I was offered a replacement one for $4 or $5 at my LBS and, in my memory, it was made by Shimano.

  22. #22
    Senior Member
    Join Date
    Feb 2009
    Posts
    3,969
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)

Posting Permissions

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