So far we've been able to eliminate the cassette and rear wheel as the cause, and we also made sure that the chain rings are properly tightened, but the "click/crunch" sound is still audible. I've never owned a set of carbon cranks, or BB30 for that matter, and I'm assuming that since the cranks are hollow there's the possibility that any structural anomaly might result in the crank making noise due to the acoustic properties of hollow carbon; it's like a microphone or speaker!
Anyway, I'm curious to find out if anybody has experienced similar problems with the FSA BB30 cranks and any suggestions regarding the culprit behind this annoying and loud click would be highly appreciated, especially with this prevailing consensus that "bottom bracket noises" usually do not always originate in the bottom bracket.......but I have a gut feeling that this one does.
ms6073 wrote:Did the bonafide mechanic apply retaining fluid (Loctite 609 or Loctite 641) into the bearing race in the bottom bracket shell before pressing in the bearings?
Locktite on the BB shell where the bearing sits? I've used bb30 for a while now and never heard of doing that? Manual specifies that the crank bolts require it...bearings though??
bikefla wrote:Is that in the instruction manual?
While I have cranks with the BB86 standard, I just took a look at the FSA BB30 installation instructions and there is no mention of using retaining fluid when installing the bearings. On the other hand, when I installed the BB86 ceramic press-fit bearing adapters on our bikes, FSA did not make mention of using Loctite 641 Bearing Retaining fluid for that application either.
ElDuderino wrote:Locktite on the BB shell where the bearing sits? I've used bb30 for a while now and never heard of doing that? Manual specifies that the crank bolts require it...bearings though??
Don't get caught up on the name - threadlock compounds are not the only thing Loctite makes. After 250-miles of enduring clicking/creaking noise when I got new TCR Advanced SL framesets with a brand new wireless SRM FSA cranks, a bit of research indicated that the Loctite solution was used by Cannodale for BB30 installations and since I applied Loctite 641 to our bottom brackets, no more clicking/creaking.
Bearings still ran perfectly. Everything was tightened and loosened. The second time the cranks were pulled out there was some very slight sign of movement between the crank axle and one of the races. Bike Mech applied some lock tight there (don't know what grade)
Never had the problem since.
Must have been a slight size mismatch between the races and the crank, the very slight movement then happened under load and resonanted in the large tubes of the frame
Hope that helps.
Are you sure its not the chain too?
I had a similar problem in my System 6, a clicking/creaking noise whenever I would pedal hard or out of the saddle. My mechanic took one look at it, said the bearings were loose, pulled off the crank and reinstalled the bearings with Loctite - problem solved.
what type of loctite are you using?
When I researched this problem for our TCR Advanced SL framesets, what I came up with was that Cannondale spec'd Loctite 609 (Green in color) in this SI Bottom Bracket Adapter installation document - http://www.cannondale.com/asset/iu_files/techcenter/2006_si_bottom_bracket_adapter_instructions_en.pdf
Checking Loctites site for the spec's on 609, it offers medium bonding strength but is also Mil Spec'd and from what I am told by someone familiar with its military application, the stuff would be darn near permanent on a BB86 application. For that reason I instead opted to use Loctite 641 (Yellow in color) but regardless of what your decide, both 609 and 641 are industrial grade retaining fluids which means they are not something you will find at your local auto parts or home repair stores.
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