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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.

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Old 05-17-07, 08:53 PM   #1
ridethecliche
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BB Play?

I posted this on the road forum but I figured that this would be a great place to seek help. Thanks a lot!

I've put my bike through over 200 miles, which isn't a lot for a lot of guys on here but I just started riding and I can only go out twice a week because of classes and the like.

After reading all the threads on here about bb creaking being something bad, I decided to inspect mine. Nothing had ever creaked on it during rides and the truvativ cranks seemed fine.

I don't have a video of the movement, but this is what I found.

Stand with the side of crankset facing you. Now take the pedal and push it towards the bike body, aka apply a vector to make the plane of the pedal, which is parallel to the bike body, such that the pedal plane intersects the plane of the bike body. Of course you can't do this, but it's the direction of the force. I did this while looking at it and applying a little bit of pressure. and to my surprise; it moved! There was a little bit of 'play'. It was a bit of to and fro movement.

I got on the bike and rode it up and down my hallway (college dorm) and I noticed that there was a weird feeling/sound that hadn't ever happened before, but it only happened at a certain point of the pedal stroke.

It's a truvativ isoflow road crankset, and I'm not sure what the bottom bracket is. My MTB has the mtb version of this crankset and there was no play with that.

Thanks guys, I'm going to take it out for a 5 min spin tomorrow to see what's going on, but I'm a little frightened.
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Old 05-17-07, 10:01 PM   #2
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Help?
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Old 05-18-07, 11:40 AM   #3
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Take it apart and look at the bearings and races - unless it is a cartridge. Then you could still take it apart, but without being 100% sure of getting it back together.
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Old 05-18-07, 12:37 PM   #4
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i had this problem before and it turned out to be the bearings. . .
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