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 11-11-10, 02:01 PM   #1
illdthedj
Senior Member
Thread Starter
 
illdthedj's Avatar
 
Join Date: Mar 2010
Location: Modesto, Ca
Bikes: klein quantum, litespeed tuscany, bianchi pista concept, centurion comp ta, centurion super le mans, traitor ringleader
Posts: 2,280
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Play in BottomBracket during trackstands

hi there

probably belongs in the mech forum but oh well i already started lol....

soooo ive been noticing a tiny bit of play in my bottom bracket, pretty sure its not loose crankarms or loose chainring......

its noticeable in a trackstand, when the pedals are level and you are balancing by twitching between back and forward force to stay still.....just a touch of play between the back and forth, if that makes sense.


i forget the model, but it was a newer model cheapo shimano bottom bracket, square taper....i guess it is a cartridge bb?


sooooo i guess i will be opening it up and taking a look, regreasing, all that.....anything i should look for?


AND A GENERAL QUESTION ABOUT FIXED GEAR AND BOTTOM BRACKETS:
does track standing and skidding Fu@@$k up bottom brackets? did i just buy a cheapo bottom bracket and thats what happens? is there a type/make/model of bottom bracket that is meant for the rigors of fixed gear riding? etc....

any info is appreciated!
illdthedj is offline   Reply With Quote
Old 11-11-10, 02:17 PM   #2
carleton
Elitist
 
carleton's Avatar
 
Join Date: Jul 2005
Location: Atlanta, GA
Bikes:
Posts: 13,142
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 45 Post(s)
Move to Mechanics...lol.
__________________
Quote:
Originally Posted by gtrob View Post
Roadies can run tempo all year as that's what humans were designed for. If you want to be a cheetah, lay around and lick your paws more.
carleton is offline   Reply With Quote
Old 11-11-10, 02:23 PM   #3
dsh
Oh, you know...
 
dsh's Avatar
 
Join Date: May 2009
Location: DC
Bikes: '74 Schwinn Sports Tourer (Polo), S-Works E5 Team Festina (Chorus 11), Trek 2200 Bonded Carbon (Fixed), Trek 920 (7 speed IGH), Chesini Olimpiade SL (1x7)
Posts: 2,835
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It has nothing to do with your bottom bracket. It's because of your chain tension, specifically that there is a little bit of slack in your chain.

This is normal and desirable.
dsh is offline   Reply With Quote
Old 11-11-10, 02:27 PM   #4
dbwoi
Senior Member
 
dbwoi's Avatar
 
Join Date: Jun 2010
Location: Davis, Ca
Bikes: Peugeot U0-8 (Stolen), Motobecane Grand Record, 80's Diamondback BMX, Peugeot Monaco
Posts: 383
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by dsh View Post
It has nothing to do with your bottom bracket. It's because of your chain tension, specifically that there is a little bit of slack in your chain.

This is normal and desirable.
Not necessarily. My bottom bracket loosens by itself somehow, even though the lockring is on tight as can be. I always have to loosen the lockring, screw in the fixed cup, and retighten. When its loose its definitely noticeable during trackstands.
dbwoi is offline   Reply With Quote
Old 11-11-10, 03:02 PM   #5
CbadRider
Administrator
 
CbadRider's Avatar
 
Join Date: Sep 2008
Location: On the bridge with Picard
Bikes: Specialized Allez, Specialized Sirrus
Posts: 5,963
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Thread moved. Welcome to Bicycle Mechanics forum.
__________________
Quote:
Originally Posted by Xerum 525 View Post
Now get on your cheap bike and give me a double century. You walking can of Crisco!!

Forum Guidelines *click here*
CbadRider is offline   Reply With Quote
Old 11-11-10, 04:20 PM   #6
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Alright let's seperate the two problems. One is 'play' due to chain tension, and the other, really is bottom bracket play.

Isolate the BB itself and test it for play by grabbing the crankarms. You may need to drop the chain off the chainring if it is difficult to tell. Also make sure that the crank itself is not loose on the BB axle.
operator is offline   Reply With Quote
Old 11-11-10, 04:54 PM   #7
cny-bikeman 
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
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: 6,288
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 41 Post(s)
Quote:
Originally Posted by YaBoiHeSoFresh View Post
Not necessarily. My bottom bracket loosens by itself somehow, even though the lockring is on tight as can be. I always have to loosen the lockring, screw in the fixed cup, and retighten. When its loose its definitely noticeable during trackstands.
Have you checked the fixed cup?
cny-bikeman is offline   Reply With Quote
Old 11-12-10, 09:48 AM   #8
ichitz
Nü-Fred
 
ichitz's Avatar
 
Join Date: Jul 2009
Location: Brooklyn, NY
Bikes: Torelli Tipo Uno (stolen), Peugeot Nice, Mercier Kilo TT
Posts: 1,517
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
play forward/backward (like in crank rotation) is most likely chain tension.
play sideways, is most likely bottom bracket.

do as operator says, remove chain and grab crank arm to test for play.
ichitz is offline   Reply With Quote
Old 11-12-10, 11:06 AM   #9
DannoXYZ 
Senior Member
 
DannoXYZ's Avatar
 
Join Date: Jul 2005
Location: Saratoga, CA
Bikes:
Posts: 11,600
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You don't need to remove the chain to check BB tightness. Rotate one arm parallel to chainstay. With one hand on chainstay and other on crankarm, move them apart and together. You can feel any play easily.
DannoXYZ is offline   Reply With Quote
Old 11-12-10, 01:55 PM   #10
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by DannoXYZ View Post
You don't need to remove the chain to check BB tightness.
And we have todays first fail.
operator is offline   Reply With Quote
Old 11-13-10, 12:21 PM   #11
hpmcardle
a bored kid
 
hpmcardle's Avatar
 
Join Date: Jul 2010
Location: East Lansing, MI
Bikes: Year unknown CCM Targa conversion
Posts: 177
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If you have an Italian threaded (R/R) bb, it might be coming loose, but I honestly don't think that would cause any play. Just get one of those funny spline wrenches for the Shimano BBs and torque the cups down. I had this problem as well as a creaking sound so I just went back on my chainring bolts, crankset bolts and chain tension and everything was fine afterwards. Fixies are really hard on the drivetrain so stuff is bound to come loose after a while, nbd.
hpmcardle is offline   Reply With Quote
Old 11-13-10, 11:36 PM   #12
Kimmo
bike whisperer
 
Kimmo's Avatar
 
Join Date: Dec 2009
Location: Melbourne, Oz
Bikes: copy/paste links: http://velospace.org/node/36949 http://velospace.org/node/47746 http://velospace.org/node/47747
Posts: 7,099
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by operator View Post
And we have todays first fail.
Quote:
Originally Posted by DannoXYZ View Post
You don't need to remove the chain to check BB tightness. Rotate one arm parallel to chainstay. With one hand on chainstay and other on crankarm, move them apart and together. You can feel any play easily.
That works without pulling the chain off.

Although of course you end up pulling the chain off if you can't find the source of play in order to check more carefully...
Kimmo is offline   Reply With Quote
Old 11-15-10, 01:36 AM   #13
vredstein
Senior Member
 
vredstein's Avatar
 
Join Date: Aug 2008
Location: Tucson, Arizona
Bikes: '02 Lemond Buenos Aires, '98 Fuji Touring w/ Shimano Nexus premium, '06 Jamis Nova 853 cross frame set up as commuter, '03 Fuji Roubaix Pro 853 back up training bike
Posts: 704
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by illdthedj View Post
AND A GENERAL QUESTION ABOUT FIXED GEAR AND BOTTOM BRACKETS:
does track standing and skidding Fu@@$k up bottom brackets? did i just buy a cheapo bottom bracket and thats what happens? is there a type/make/model of bottom bracket that is meant for the rigors of fixed gear riding? etc....

any info is appreciated!
I suspect it may. I developed play in a Phil Wood bb used on a fixed gear bike in a bit over a year. Developed play in a replacement Sugino unit. I've had a Phil Wood bb on my regular road bike for five years with no issues. It could also have to do with periods when your chain tension is real tight. This puts stess on the BB.
vredstein 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 04:22 PM.