Jump to content








Photo

Knocking while pedaling


  • Please log in to reply
7 replies to this topic

#1 doctorold

doctorold

    Advanced Member

  • Members
  • PipPipPip
  • 238 posts

Posted 27 January 2011 - 12:47 PM

I have a problem of a knocking while I'm pedaling.  Pedal or crank arm is not hitting frame.  Pedal is tight.  Crank arm is tight. It does knock at the same point of pedal stroke (left pedal straight up). I can actually sort of feel it in the bottom of my shoe when pedaling.  It sounds like when I was a kid and the pedal hit the kickstand that was not put up all the way.  Difference being it does not make the knocking sound on every stroke.  Just most.  Thoughts, suggestions, ideas on what this could be would be much appreciated.  















#2 alfeng

alfeng

    Advanced Member

  • Members
  • PipPipPip
  • 6,229 posts

Posted 27 January 2011 - 03:38 PM

FWIW. If the sound isn't present when the bike is in a workstand (or, when someone is holding the rear wheel off the ground & you are turning the crank) then check your cleats ...

 

    



#3 davereo

davereo

    Advanced Member

  • Members
  • PipPipPip
  • 1,639 posts

Posted 27 January 2011 - 05:18 PM



Originally Posted by alfeng View Post

FWIW. If the sound isn't present when the bike is in a workstand (or, when someone is holding the rear wheel off the ground & you are turning the crank) then check your cleats ...

 

    


Check your cleats as stated. I had a screw that held the gripper on a cleat back out just enough that it was getting caught on the spring retainer plate of my pedal making a noise like you are describing.   



#4 oldbobcat

oldbobcat

    Advanced Member

  • Members
  • PipPipPip
  • 2,911 posts

Posted 27 January 2011 - 08:01 PM

Crank arm hitting the front derailleur cage? Just checking.



#5 swampy1970

swampy1970

    Advanced Member

  • Members
  • PipPipPip
  • 9,304 posts

Posted 28 January 2011 - 06:51 AM

Possibly dead bearings in the bottom bracket 



#6 doctorold

doctorold

    Advanced Member

  • Members
  • PipPipPip
  • 238 posts

Posted 28 January 2011 - 09:25 AM

I gave up trying to figure it out and dropped it off at my LBS.  The guy there agrees that it's probably the bearings in the bottom bracket.  I'll find out later after he gets into it.  Thanks for the responses everyone.  



#7 74extiger

74extiger

    Member

  • Members
  • PipPip
  • 17 posts

Posted 28 January 2011 - 01:52 PM

I had knocking from my crankset. Same symptoms and conditions you describe. It turned out that the bottom bracket was a little too short for the frame, so the inner chain wheel was rubbing the rear stays. The bike was custom built with Campy Ergo. 

 

Who wudda thunk it?

 

Gary Curtis



#8 doctorold

doctorold

    Advanced Member

  • Members
  • PipPipPip
  • 238 posts

Posted 29 January 2011 - 06:53 AM

This is good....I get my bike back and tech tells me he took it apart, inspected all, bottom bracket is fine.  Greased and put it all back together and it's fine (or seems to be). Took a few pedal strokes and no sound.  I'll tell you after a few miles how it's going.  But I loved what he said: "frankly, I have no idea what the probably was".  

 

UPDATE:  Rode 24 miles today without a peep.  Running as smooth and quiet as ever.  Great day to be out.  55 and sunny.  Didn't miss the cycle trainer at all!






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users