Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the April Giveaway for an Electric Bicycle Roadster V2 from Ride1UP


Squeak
#1
I have a squeak that seems to occur on every third rotation only when I'm applying real pressure such as climbing or accelerating hard. Seems to be from the rear but hard to tell. Had the bike (2014 Tarmac w/ultegra)serviced and it was quiet for about 100 miles and now the squeak has returned. Any ideas? Thanks!
  Reply
#2
Third rotation of the cranks or the wheels?

There are many potential sources of noises on the bicycle. Along the way, you have to determine if the noise is related to crank rotation, wheel rotation or neither.

Crank rotation possibilities include, but are not limited to: seat post, rear q/r skewer not tight enough, dropouts, frame, chain, ...

Wheel rotation possibilities include, but are not limited to: spoke tension, tire defects, rim defects, freehub, cassette, .....
Nigel
  Reply
#3
The chain takes more than one rotation to complete a circuit of the drive chain, so a gear combo such as 42-14 would bring the chain around once every 3 crank revs (42/14=3). The chain usually makes the most noise as it passes through the pulleys.
  Reply
#4
Also when trying to track down a creak, squeak or whatever the sound, it is important to try to pinpoint, that you try one thing at a time, then test ride and go from there. If you do 3 things at once and the squeak is gone, you do not pinpoint what the actual cause was.
There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
  Reply
#5
(01-20-2015, 06:42 PM)cny-man Wrote:  The chain takes more than one rotation to complete a circuit of the drive chain, so a gear combo such as 42-14 would bring the chain around once every 3 crank revs (42/14=3). The chain usually makes the most noise as it passes through the pulleys.

Thanks very much - I'll try to pay attention to the specific gearing
(01-20-2015, 12:49 PM)nfmisso Wrote:  Third rotation of the cranks or the wheels?

There are many potential sources of noises on the bicycle. Along the way, you have to determine if the noise is related to crank rotation, wheel rotation or neither.

Crank rotation possibilities include, but are not limited to: seat post, rear q/r skewer not tight enough, dropouts, frame, chain, ...

Wheel rotation possibilities include, but are not limited to: spoke tension, tire defects, rim defects, freehub, cassette, .....

Every third crank rotation, and only under real torque. Thanks for the ideas!
  Reply
#6
(01-20-2015, 11:33 AM)dwc7 Wrote:  I have a squeak that seems to occur on every third rotation only when I'm applying real pressure such as climbing or accelerating hard. Seems to be from the rear but hard to tell. Had the bike (2014 Tarmac w/ultegra)serviced and it was quiet for about 100 miles and now the squeak has returned. Any ideas? Thanks!

It could be your crankset, bottom bracket or pedals.
  Reply
#7
Could be a bent rear axle spindle that is what happened to me with the same thing.
  Reply
#8
Every third rotation of cranks might point to a chain issue. It typically takes 2-3 rotations of the cranks to make the chain run through it's whole length one time. Most other parts would squeak in time with the crank or wheel rotation. But squeaks are notoriously hard to track down so YMMV.
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
14,080
06-08-2011, 01:02 AM
Last Post: scottclark
 
17,360
04-16-2010, 09:51 AM
Last Post: lkn2myis

Forum Jump:

[-]
10 Latest Posts
What’s the name of this bottom bracket ?
Today 09:03 AM
Hi folks!
Today 07:28 AM
2021 Pro Road Cycling
Today 06:09 AM
Bicycle Day
Today 04:56 AM
Is Dunlop valve almost the same as Prest...
Yesterday 08:49 PM
How many people ride everyday?
04-19-2021 05:34 PM
Are electric bikes the future?
04-19-2021 04:26 PM
Can you help me identifying this Gitane?
04-17-2021 01:24 AM
Brake wire
04-16-2021 10:05 PM
NordicTrack U300 Knocking
04-15-2021 10:03 PM

[-]
Top 5 Posters This Month
no avatar 1. Jesper
16 posts
no avatar 2. Mark Zucker
5 posts
no avatar 3. Kgirl
5 posts
no avatar 4. Papa Dom
5 posts
no avatar 5. J_R_Schultz
5 posts