Advertise on Bikeforums.net



User Tag List

Results 1 to 14 of 14
  1. #1
    .
    Join Date
    May 2006
    Location
    Hillsboro, Oregon
    My Bikes
    Moots Psychlo-x ybb, Soma ES, Trek 950
    Posts
    3,741
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Stiff bottom bracket

    hi all,

    Put my new frame together today and the bottom bracket is quite stiff. It's a Shimano R700 crankset and I used the bottom bracket that came with it. It turns ok, but doesn't spin freely and seems like it has a little resistance to it.

    Could it be that the grease is just a little dried out and will loosen with use?

    Thanks
    Demented internet tail wagging imbicile.

  2. #2
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    916
    Mentioned
    31 Post(s)
    Tagged
    0 Thread(s)
    New Parts?
    You may not notice it after a few weeks of riding on it, some seal friction likely ..
    lever of the crank is long..

  3. #3
    .
    Join Date
    May 2006
    Location
    Hillsboro, Oregon
    My Bikes
    Moots Psychlo-x ybb, Soma ES, Trek 950
    Posts
    3,741
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Yeah, picked it up from a trusted vendor that I do business with.
    Demented internet tail wagging imbicile.

  4. #4
    Mechanic/Tourist
    Join Date
    Apr 2007
    Location
    Syracuse, NY
    My Bikes
    2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
    Posts
    5,033
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    No way to tell remotely what you mean by "it doesn't spin freely" but some resistance is to be expected on a new BB. If it does not feel outright rough and rotates with even resistance I would not worry about it. All bearings run better when broken in with some miles, as long as they are kept adjusted.

  5. #5
    Senior Member
    Join Date
    Oct 2008
    Location
    Ohio
    My Bikes
    Franklin Frames Custom, Rivendell Bombadil, '83 Specialized Stumpjumper
    Posts
    1,289
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Bottom brackets these days are nothing like ye old days of cups and cones where you could spin the cranks with ease. With all the seals these days, they won't spin so freely. What matters is how they spin under load, and as long as that's fine there's no worry.

  6. #6
    .
    Join Date
    May 2006
    Location
    Hillsboro, Oregon
    My Bikes
    Moots Psychlo-x ybb, Soma ES, Trek 950
    Posts
    3,741
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    It spins and it's even. I've just never had one that was as stiff as this one. These are the outboard cup model so there is no adjustment. I'll put some miles on it and see how it goes. Worse case is I change them with the some known good one's that I have.
    Demented internet tail wagging imbicile.

  7. #7
    ٩๏̯͡๏)۶ Luke52's Avatar
    Join Date
    Jul 2008
    Location
    Melbourne, Australia
    My Bikes
    2010 Giant Filter 1. 07/08 Apollo Independent.
    Posts
    502
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by knobster View Post
    It spins and it's even. I've just never had one that was as stiff as this one. These are the outboard cup model so there is no adjustment. I'll put some miles on it and see how it goes. Worse case is I change them with the some known good one's that I have.
    Outboard, or external bearing BBs, do tend to be a bit stiffer than conventional BBs. I wouldn't worry about it at all.

  8. #8
    17yrold in 64yrold body
    Join Date
    May 2010
    Location
    Northern CA
    Posts
    922
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by knobster View Post
    It spins and it's even. I've just never had one that was as stiff as this one. These are the outboard cup model so there is no adjustment. I'll put some miles on it and see how it goes. Worse case is I change them with the some known good one's that I have.
    When I decided to put an XT crank with external BB on my touring bike, I ran into a 'stiff crank' situation. It turned out that I had not been able to tighten the drive side cup completely, and the non-drive side would make the setup 'stiff' when tightened. I chased the drive side threads, and now the drive side cup tightens completely, and all is well!

    If you can fit a thin (.o12 or so) feeler gauge between your BB cup and BB shell, you MAY not have the cup completely tight. If a feeler gauge will NOT fit in between, then it is probably seal friction at work.

  9. #9
    Senior Member
    Join Date
    Sep 2009
    Location
    New Milford CT
    Posts
    143
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Did you have the bottom bracket faced? If the cups are not dead parallel the axle will not spin freely.

  10. #10
    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 rwortman View Post
    Did you have the bottom bracket faced? If the cups are not dead parallel the axle will not spin freely.
    They need to be parallel AND square to the BB threads.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  11. #11
    Senior Member
    Join Date
    Sep 2009
    Location
    New Milford CT
    Posts
    143
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    And coaxial with each other. Bottom line is to get the BB chased and faced to make sure the cups are properly positioned.

  12. #12
    .
    Join Date
    May 2006
    Location
    Hillsboro, Oregon
    My Bikes
    Moots Psychlo-x ybb, Soma ES, Trek 950
    Posts
    3,741
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by rwortman View Post
    Did you have the bottom bracket faced? If the cups are not dead parallel the axle will not spin freely.
    No I sure didn't. That may be a good idea along with them chasing the threads while they are at it.
    Demented internet tail wagging imbicile.

  13. #13
    .
    Join Date
    May 2006
    Location
    Hillsboro, Oregon
    My Bikes
    Moots Psychlo-x ybb, Soma ES, Trek 950
    Posts
    3,741
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    well, I figured out my issue. It was my stupidity... Nothing wrong with the bottom bracket or shell. The cable guide under the bottom bracket had a bolt that was too long....... Removed that, cut it, reinstalled, worked fine... Live and learn.
    Demented internet tail wagging imbicile.

  14. #14
    Senior Member MudPie's Avatar
    Join Date
    May 2004
    Location
    Southern California
    Posts
    1,874
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by knobster View Post
    well, I figured out my issue. It was my stupidity... Nothing wrong with the bottom bracket or shell. The cable guide under the bottom bracket had a bolt that was too long....... Removed that, cut it, reinstalled, worked fine... Live and learn.

    Experience is the teacher who gives the final exam first. And you passed!

    Glad you figured it out!

Posting Permissions

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