Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 04-19-06, 06:10 PM   #1
BrokenGlass
Senior Member
Thread Starter
 
BrokenGlass's Avatar
 
Join Date: Oct 2005
Location: South East MI
Bikes: 09 Specialized Stumpjumper Elite, 09 Specialized Tricross Comp, 04 Giant TCR2
Posts: 59
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
movement in BB

today while cleaning off my bike and inspecting it all, i noticed there to be some play in the BB. when crank arms are parallel with the ground, they will move back and forth slightly. i just replaced the crankset and when i looked the BB i didnt notice any movement, and it seemed to be in good condition still. is there a chance that it could just be loose, or is it shot? its a square taper if that matters.
thanks for any help.

the picture is while looking down on the bike.
Attached Images
File Type: jpg Copy of IMG_0073.JPG (94.2 KB, 17 views)
BrokenGlass is offline   Reply With Quote
Old 04-19-06, 06:37 PM   #2
DieselDan
Senior Member
 
DieselDan's Avatar
 
Join Date: Mar 2003
Location: Beaufort, South Carolina, USA and surrounding islands.
Bikes: Cannondale R500, Motobecane Messenger
Posts: 8,521
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Time to replace the BB cartridge, or replace the BB bearings.
DieselDan is offline   Reply With Quote
Old 04-19-06, 09:32 PM   #3
cascade168
Klaatu barada nikto
 
cascade168's Avatar
 
Join Date: Sep 2004
Location: Southern NH
Bikes:
Posts: 1,453
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by BrokenGlass
today while cleaning off my bike and inspecting it all, i noticed there to be some play in the BB. when crank arms are parallel with the ground, they will move back and forth slightly. i just replaced the crankset and when i looked the BB i didnt notice any movement, and it seemed to be in good condition still. is there a chance that it could just be loose, or is it shot? its a square taper if that matters.
thanks for any help.

the picture is while looking down on the bike.
If it's a cartridge type you need to replace it. If it's a cup & cone type, it may just need to be properly adjusted. How old is this bike? It would help determine the BB type if you can post some close up pictures of the ends of the BB. If you determine it is a cup & cone type, here is the adjustment proceedure:

http://www.parktool.com/repair/readhowto.asp?id=93
cascade168 is offline   Reply With Quote
Old 04-20-06, 07:09 PM   #4
BrokenGlass
Senior Member
Thread Starter
 
BrokenGlass's Avatar
 
Join Date: Oct 2005
Location: South East MI
Bikes: 09 Specialized Stumpjumper Elite, 09 Specialized Tricross Comp, 04 Giant TCR2
Posts: 59
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
thanks for the replies. i think its a cup & cone type BB. heres a picture of the non-driveside of it from when i was replacing the crankset. i have more pictures than this one if youd like to see the drive side too. the bike is a 2003

sorry about the delay in reply. professors decided to pile on the work.
Attached Images
File Type: jpg IMG_0027-1.jpg (96.2 KB, 18 views)
BrokenGlass is offline   Reply With Quote
Old 04-20-06, 07:57 PM   #5
cascade168
Klaatu barada nikto
 
cascade168's Avatar
 
Join Date: Sep 2004
Location: Southern NH
Bikes:
Posts: 1,453
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by BrokenGlass
thanks for the replies. i think its a cup & cone type BB. heres a picture of the non-driveside of it from when i was replacing the crankset. i have more pictures than this one if youd like to see the drive side too. the bike is a 2003

sorry about the delay in reply. professors decided to pile on the work.
What I see in that picture looks like a typical cartridge type bottom bracket. The giveaway is that it clearly has a 20_spline ring which is typical of cartridges. Plus, most bikes new in 2003 would have cartridge BBs. You can get a new one for $15-20.
cascade168 is offline   Reply With Quote
Old 04-20-06, 08:47 PM   #6
BrokenGlass
Senior Member
Thread Starter
 
BrokenGlass's Avatar
 
Join Date: Oct 2005
Location: South East MI
Bikes: 09 Specialized Stumpjumper Elite, 09 Specialized Tricross Comp, 04 Giant TCR2
Posts: 59
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
thanks for the help. is replace the cartridges easy? i'm still a novice in bike repair but want to be able to do most of it myself in the long term. i ride everyday (well, when i dont have too much school work). basically i dont want to screw anything up and then be out of a bike for weeks.
BrokenGlass is offline   Reply With Quote
Old 04-21-06, 05:40 AM   #7
cascade168
Klaatu barada nikto
 
cascade168's Avatar
 
Join Date: Sep 2004
Location: Southern NH
Bikes:
Posts: 1,453
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by BrokenGlass
thanks for the help. is replace the cartridges easy? i'm still a novice in bike repair but want to be able to do most of it myself in the long term. i ride everyday (well, when i dont have too much school work). basically i dont want to screw anything up and then be out of a bike for weeks.
See this page for full instructions on how to replace a cartridge style BB:

http://www.parktool.com/repair/readhowto.asp?id=94
cascade168 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 04:52 PM.