Knocking when pedalling?

[Lukethebiker]

I have a knocking noise that I can feel in my pedals, just before it clicks or knocks the pedals get harder to push then get loose/ become normal again in each push. I bought the bike about 8 weeks ago and the noise has been getting louder so nothing could of broke or got loose or anything. It only occurs when I'm on my bike and not when I'm trying to look at it. Any ideas?

 

[mjr]

What sort of pedals (any brands or codes on them) and was the bike new?

 

[Hugh Manatee]

Grab a crank in either hand and push/pull mightily. Could be the bearings in the bottom bracket falling apart.

 

[Yellow Saddle]

The BB is suspect. If you can, remove the chain. Put the bike on a secure stand or get someone to hold if off the floor for you. Spin the crank and put your ear on the top tube. If the bearing rumbles, it is kaput. If it whooses, it is fine.

 

[vickster]

Did you buy it new...in a shop? If so take it back no get the mechanic to take a proper look

 

[keithmac]

I would have said bottom bracket as well.

 

[Saluki]

I have this on my CX, I suspect the BB too Shopping is imminent then.

 

[mjr]

Oh I thought it was the actual pedals that were tightening/loosening (probably failing pedal bearings), not that the cranks were becoming harder to turn!

 

[bike mad]

I have a knocking noise that I can feel in my pedals, just before it clicks or knocks the pedals get harder to push then get loose/ become normal again in each push. I bought the bike about 8 weeks ago and the noise has been getting louder so nothing could of broke or got loose or anything. It only occurs when I'm on my bike and not when I'm trying to look at it. Any ideas?

you need to see if you can get grease in or will sieze up

 

[gs-velo]

could be the bottom bracket . check to see if its loose or check the pedals as well . both easy to replace and fairly cheap