Advertise on Bikeforums.net



User Tag List

Results 1 to 11 of 11
  1. #1
    Yeti
    Join Date
    Jun 2006
    Location
    Chandler, AZ
    My Bikes
    Chopper from the grocery store.
    Posts
    84
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Replacing bottom bracket - need advice.

    I need to replace my bottom bracket, but need a little advice. I am replacing a TH Industries 7420AL in which one of the races disintegrated. I went to my bike shop and asked for a 68x118, which is what I understood to be the right unit for the BikeE. They sold me a Shimano UN73 Cartridge BB and said it was 118, but it is longer than the one I took out. I think it is a 122 and mine is 118.

    Is there any problem with putting a cartridge in as a replacement for a non-cartridge?
    Does the extra length hurt anything or do I need to track down a 118? There is only one chainring on the crank.
    Is the UN73 a decent unit? It's on a long wheel base recumbent.

    Any tips for when I put it back together? Is grease good or do I need antiseize?

    Thanks,
    Mike.

  2. #2
    Asshat skingry's Avatar
    Join Date
    Jul 2005
    Location
    Atlanta, GA
    Posts
    333
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Have you measured the spindle on the old BB? The Q factor and chainline will be vastly different going from a 118 to a 122.
    Ride bikes, listen to SLAYER.

  3. #3
    Yeti
    Join Date
    Jun 2006
    Location
    Chandler, AZ
    My Bikes
    Chopper from the grocery store.
    Posts
    84
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Near as I can measure, it's 118mm.

    Thanks, I'll return the 122 and get a 118. Is it ok to put a cartridge unit in there?

  4. #4
    Senior Member
    Join Date
    Nov 2004
    Location
    Bay Area, CA
    My Bikes
    SC superlight, CK hs/wheels, XT, Race Face, blah blah blah
    Posts
    87
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    yes, its fine

  5. #5
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,295
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Un73s are good stuff. UN anything is pretty much gold.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  6. #6
    Senior Member
    Join Date
    Nov 2006
    Posts
    61
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    there are 2 measurments you must be sure of 1 the length of the spindel and 2 the length of the bb shell if these match clean and face the shell before you install it and alway check your thread direction you don't want to cross threads

  7. #7
    Senior Member
    Join Date
    Aug 2005
    Posts
    1,616
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've never seen a Shimano bottom bracket that didn't have the specs printed right on it. Usually in the middle of the barrel portion, between the two ends.

    Bob

  8. #8
    Call me The Breeze I_bRAD's Avatar
    Join Date
    Aug 2006
    Location
    Corbyville Ontario
    My Bikes
    2004 Litespeed Siena, 1996 Litespeed Obed, 1992 Miele (unknown model), 1982 Meile Uno LS.
    Posts
    3,699
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by operator
    Un73s are good stuff. UN anything is pretty much gold.
    UNdeniably.

  9. #9
    Bike Junkie aadhils's Avatar
    Join Date
    Mar 2005
    Location
    Santa Clara, CA
    My Bikes
    Orange Brompton M3L; Milwaukee Bicycle Co. Fixie (Eddy Orange)
    Posts
    1,585
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by operator
    Un73s are good stuff. UN anything is pretty much gold.
    Phil wood ones are even better...

  10. #10
    Elitist Troglodyte DMF's Avatar
    Join Date
    Jun 2006
    Location
    Dallas
    My Bikes
    03 Raleigh Professional (steel)
    Posts
    6,896
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    But a LOT more expensive.
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

  11. #11
    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 aadhils
    Phil wood ones are even better...
    better in price yes. If by better you mean more expensive.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

Posting Permissions

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