Cranky Cranks or BB's

[Trailhead]

Two of my riding buddies and I have had clunking noises from our cranks. Usually under hard load pedalling and at about the 2 o'clock position of the right crank. Anyone ever experience this? Its intermittent and I even replaced a BB cartridge thinking this would surely cure it but it came back. However on one guys bike I took out the BB cartridge and put it back in and the noise was gone. Go figure!

There is something we are missing. Brains perhaps?

[wooglin-at-home]

Tighten crank bolts.
Tighten chainring bolts.
Tighten BB.

Report back. Was anything loose?

Also, is your chain skipping?

[Trailhead]

Done
Done
Done

One bike had a bad chain at the same time. This is the one that went back to normal after doing all of the above. The other 2 bikes, both Jamis Dakar Experts, I have not figured out at all. It made me wonder if there was ever a bad batch of Shimani BB-ES70.

[Andy in Wi]

Could be... the es-70s are no longer available, only the es-71. I think there is a year warrenty on those, so if there is a prob and it's less than a year, have a shop warrenty it through QBP, which will send you a new unit in the mean time (you might have to "buy" it first and wait for them to verify it as a warrenty issue). I had a similar problem with an Ultregra bb, which was replaced by a "different" ultegra bb, nothing mentioned, no change in the actual model year.