Squeaky sound. Help me identify the problem!

[reakz93]

Hi everyone, this is my first post.

Bike is Cannondale Prophet 2009.
This sound started few months ago. We changed chain, rear and front sprocket (all 3 on front). And we still cannot identify where does this sound come from.

It goes away when I wash it with high pressure mini-wash but starts coming back gradually after 10-20min of riding, and starts to get really loud after an hour.

Video link

Thank You

 

[iluvmybike]

Could be all sorts - sometimes the little rubber covers on hubs get dry and squeak, could be hub bearings, chain, pedal bearings, shoe cleats, shoe brushing against crank or bottom bracket, seatpost creaking etc . But from video I'd guess at bottom bracket if anything
Best to step away from the high pressure wsher - prob blasting all good grease out of everything!

 

[Big John]

Sounds like a bottom bracket issue. Is there any play in the crank arms? Try taking the chain off and spinning the cranks to see if it all runs freely. I've tried to find the specs for a Cannondale Prophet but failed miserably. Noises can sometimes be a nightmare to pinpoint but if I were a betting man, which thankfully I'm not, I'd go for the BB.

 

[Bazzer]

Before getting into the oily/greasey bits, try the seat post. Both where it joins the frame but also the seat. My Cannondale Synapse has had a couple of episodes of creaking, which I thought was the bottom bracket. Finally traced to the seat post where it meets the frame. It needed a smear of grease.

 

[fossyant]

Seatpost or saddle cos you were not pedalling. Squirt some oil into where the saddle rails get into the plastic saddle base. You also need to remove the post and also take saddle off the post and grease it after you've cleaned it up.

 

[reakz93]

Bottom bracket had that clicking sound last year, I replaced it already.

Unfortunately it's the frame. We disassembled everything, put nothing but the frame on the ground, and started twisting it.
It's making the exact sounds somewhere around middle-bottom, right above the BB slot but we cannot identify where exactly and why. Sometimes I feel that it even starts from the rear.
Whatever it is, frame is done I guess.

Of course it had to be the worst...what a sad day, and life.

 

[weareHKR]

I wouldn't leave it at that, I'd have the paint stripped off & find out what lurks underneath, looking for cracks, I'd need to know.
could even possible repaired...

 

[alicat]

Glad you identified it before you had an accident.