- Member29 December 2008 at 5:53 pm
For a while now my bike is making an awful crunching noise when I’m peddling hard. The noise is always there but seems worse if I’m putting a lot of pressure on the pedals.
I’m guessing that there’s a problem with the crank but I’d appreciate some advice on how I find the cause of the problem and if it is the crank, is it an easy part to fix / replace?
- Member29 December 2008 at 6:08 pm
If you can give us some more details as to what bike and BB/crank your running then we should be able to help more.
And welcome to the forum.
- Member29 December 2008 at 6:09 pm
Are you sure it’s not the pedals first, before you go messing about with crank. Could be the bearings in the pedals have gone.
Couldn’t you borrow a pair to swap and have a test ride.
Different pedals+no noise=problem sorted.
Also, does the noise occur when you stand up and pedal or is it just when seated.
Again, if it’s making an awful crunching noise when you pedal hard, I’d be surprised if it wasn’t making some noise when you just rotate the crank or pedals or at least feel “rough” in one of these areas. Do it with the bike stationary and have a good listen/feel.
- Member29 December 2008 at 7:43 pm
Yeah I suppose it could be the pedals (hopefully!) – I’ll try swapping them with another pair and let you know how I get on.
Thanks for the advice.
- Member29 December 2008 at 7:49 pm
Where you from Mungo ??
Used to know a Mungo from Gateshead.
- Member29 December 2008 at 8:12 pm
Currently living in Gateshead but I’ve only just moved here so they’re are 2 Mungo’s here now.
- Member30 December 2008 at 11:24 am
Full sus bikes sometimes produce lots of horrible noises from pivots and bearings which are hard to track down.
As above I’ve chased creaks all over and found the pedals to be the problem. After that it’s bottom bracket and also check the frame for any cracks, especially around the welds at the BB shell.
- Member30 December 2008 at 3:19 pm
Might sound silly but what state is your chain in ?
If its not had a run out or a clean in while, the chain can make some awful noises when you put the pedal down.
I tried some new chain lube not so long back, the waxy kind, it made my chain make a right racket, so much so that I thought it was the bottom bracket and stripped everything down, a good clean of the chain did the job in the end.
- Member30 December 2008 at 5:26 pm
Good thinking – my chain hasn’t had a good clean in ages. I’ll give that a go first and see what happens.
I’ll post what I find after I’ve done the work.
- Member30 December 2008 at 6:40 pm
Hi Mungo and welcome too the forum..
Is there any play when you move the pedals side too side from the BB?
- Member1 January 2009 at 7:47 pm
Ok, well I’ve checked the pedals and they seem fine – no play in the etc. I’m stripping the bike down tomorrow so hopefully it’s just in need of a very good clean. I’ll post the results. Cheers – Mungo
- Member7 January 2009 at 11:15 am
Mungo, how did you get on?
I had the same with shimano octalink. Try changing the tightness of the crank/bb studs, and see if this changes the noise. If so, there’s your answer!
See related thread:
- Member7 January 2009 at 11:35 am
i had an awful crunching sound cuming from my bike the other day. i kept thinking it was my crank but the noise was happing wen is was pedaling hard and it turned out to be my cassette it was loose, my lock ring snapped. when i was pedaling on the smallest cogs on my cassete the noise was happening.
i hope you sus the problem 😀
- Member7 January 2009 at 11:52 am
I’m giving in and taking it to my local mtb dealer for a good service and repair. I thought I might as well as the rear wheel needs straightened as well as finding a cure for the crunching noise.
I’ll post the results of the service ASAP.
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