[kuksul08]

http://www.vimeo.com/2274556

I bought a new chainring to hopefully fix it because it's the last thing I can think of. So far I have:
-rebuilt BB
-greased crank interface
-greased pedal interface and tried different pedals
-greased chainring bolts
-rebuilt pivots

 

[jjym]

Maybe check out both derailleurs and the chainring is not hitting the front one under torque. Make sure your rear wheel is seated well too. Also check for a tight link in your chain. Wriggle your crankset hard back and forth for any play. Turn upside down and pedal to see if it makes the sound to a lesser degree.

 

[sanjuro]

Check the derailleur hanger bolt. People miss that one.

 

[kuksul08]

There's no play in the crankset. I don't have a front derailleur so it couldn't be that. It's ONLY when I pedal hard, and not dependent on the chain or cassette position. Der hangar bolts are tight as is the axle.

I was able to rotate he chainring with respect to the crank holes (by 90 degrees), and suddenly it only clicked when I pedaled with the left crank. This leads me to believe it's in that area.

I tried different chainring bolts, and some spacers also but to no avail. I will update when the new chainring comes but sheesh IDK how that could be causing it.

 

[sanjuro]

I would replace the BB.

Rebuilding a sealed bearing BB sounds wrong.

 

[kuksul08]

I would replace the BB.

Rebuilding a sealed bearing BB sounds wrong.

sorry, by rebuilding I meant taking it out and checking it, then replacing it in the BB shell with grease. The bearings inside were butter.

 

[dhspeedster]

I've pulled BB's out in the past for them to feel smooth as silk yet that can easily betray a cracked race or ball (and has done so very effectively for me - cue lots of cursing).

 

[kuksul08]

So... I got the new chainring in the mail surprisingly fast from Price Point. It's a dangerboy 34T... damn this thing is BEEF and high quality. Threw it on and the noise is 100% gone. FINALLY

I am trashing the old one and all the misery it cost me now

 

[sstalder5]

my fr rig makes the exact same noise but i haven really messed with it because i'm replacing my bb and cranks to run a single ring w/chainguide soon but im glad when i replace it that stupid sund will go away. you never know how annoying it can be until your bike starts making that noise

 

[pee dot one]

Pull out BB, clean threads on BB/inside shell on frame. Wrap BB threads in teflon tape, 2 or 3 layers. Grease outside of tape layer, grease shell threads on frame. Reinsert BB slowly, to avoid cross threading.

 

[kuksul08]

Pull out BB, clean threads on BB/inside shell on frame. Wrap BB threads in teflon tape, 2 or 3 layers. Grease outside of tape layer, grease shell threads on frame. Reinsert BB slowly, to avoid cross threading.

I do this exact process already :biggrin: I used to only use grease but then the non-drive side cup started backing out during a ride, so the teflon tape increases the resistance and it has been flawless since.

 

[oldfart]

Often a bb or other bearing will feel smooth while turning it in your fingers. Notice how you only get the creak when you pedal hard? You can't load a bearing like that with your fingers. While it could be other things suggested I think the bb is toast. That's what I hear anyway. ISIS bb?

What make of chainring and is it compatible with the crank? I had an ICON (Trek house brand) crank a few years back that had a bolt pattern that was compatible with Shimano, but the Shimano XT mid ring was not compatible. Kind of a long shot but it's all I can think of at the moment. Other than a cracked frame or crank but I assume you have elliminated these possibilities already.