Play in BottomBracket during trackstands
11-11-10, 02:01 PM
#1
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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@@$k up bottom brackets? did i just buy a cheapo bottom bracket and thats what happens? is there a type/make/model of bottom bracket that is meant for the rigors of fixed gear riding? etc....
any info is appreciated!
probably belongs in the mech forum but oh well i already started lol....
soooo ive been noticing a tiny bit of play in my bottom bracket, pretty sure its not loose crankarms or loose chainring......
its noticeable in a trackstand, when the pedals are level and you are balancing by twitching between back and forward force to stay still.....just a touch of play between the back and forth, if that makes sense.
i forget the model, but it was a newer model cheapo shimano bottom bracket, square taper....i guess it is a cartridge bb?
sooooo i guess i will be opening it up and taking a look, regreasing, all that.....anything i should look for?
AND A GENERAL QUESTION ABOUT FIXED GEAR AND BOTTOM BRACKETS:
does track standing and skidding Fu@@$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!
11-11-10, 02:23 PM
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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.
This is normal and desirable.
11-11-10, 02:27 PM
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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.
11-11-10, 03:02 PM
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Thread moved. Welcome to Bicycle Mechanics forum.
11-11-10, 04:20 PM
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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.
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.
11-11-10, 04:54 PM
#7
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Have you checked the fixed cup?
11-12-10, 09:48 AM
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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.
play sideways, is most likely bottom bracket.
do as operator says, remove chain and grab crank arm to test for play.
11-12-10, 11:06 AM
#9
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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.
11-13-10, 12:21 PM
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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.
11-13-10, 11:36 PM
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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...
11-15-10, 01:36 AM
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AND A GENERAL QUESTION ABOUT FIXED GEAR AND BOTTOM BRACKETS:
does track standing and skidding Fu@@$k up bottom brackets? did i just buy a cheapo bottom bracket and thats what happens? is there a type/make/model of bottom bracket that is meant for the rigors of fixed gear riding? etc....
any info is appreciated!
does track standing and skidding Fu@@$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!
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