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Wrench monkeys please HELP: odd drivetrain issue

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Wrench monkeys please HELP: odd drivetrain issue

Old 07-28-08, 07:44 PM
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Wrench monkeys please HELP: odd drivetrain issue

My Cdale TT bike crankset has a weird click that I feel through the left crankarm when that arm approaches horizontal on most pedal revolutions. Only under load. Can't reproduce it on the stand. Almost felt like the zip tie holding the cadence magnet was rubbing (I cut it off, that's not it), so it's not so much a click you can hear, more like one you can feel. Very strange. Lubed the pedal. Crankset doesn't appear loose, rotates perfectly, I only feel this when I'm pedaling moderately to hard, distinctly feels like it's on the left side (opposite the chainrings). But it does not seem to hamper the bike's performance. It does drive me crazy of course.

I have a TT Sat AM, bike seems to ride OK. I'm riding it 40+ miles hard tomorrow AM, we'll see if it gets worse. I already tried to find a weird link in the chain, it looks fine. The rear free hub is not doing that on another bike, that's not it either.

BB bearing or adjustment issue?? I have NEVER experienced anything like this before. Any ideas greatly appreciated.
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Old 07-28-08, 07:50 PM
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In my (somewhat limited) experience, these things are caused by something external (your foot clipping something, a zip-tie, the front derailleur cable end etc. etc.) 90% of the time. 5% of the time it can be fixed by removing the crank, cleaning, re-greasing, and re-assembling. 3% are an actual problem requiring a new part (e.g., bearing). The remaining 2% are a mystery sent to drive one crazy.

For you I'm guessing it's the 2%.
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Old 07-28-08, 07:53 PM
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It might be a pitted bearing race.

Has the rig ever been in the rain?
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Old 07-28-08, 07:53 PM
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The click is in you, Pcad. It is saying, "Pcad, you're old."
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Old 07-28-08, 07:54 PM
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Old 07-28-08, 07:55 PM
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Replace the BB bearings.
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Old 07-28-08, 07:56 PM
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Are you sure it's not your own knee clicking? I can hear mine click when I load it heavy, and even feel it in my foot. I thought it was the crank arm or pedal making the noise. I finally figured it out one day when I was riding no handed with my hands on my knees, and felt it plain as day.
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Old 07-28-08, 07:57 PM
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I had something similar with my Ultegra equipped bike. I finally bought the appropriate tool to take the BB apart (external BB), took it apart, lubed all the threads really well with grease as well as the splined connection for the left crankarm, reassembled it, and presto, no more click click. And the horrors, I didn't use a torque wrench . Just take care to not strip the bolts holding the left crankarm onto the spindle and torque both bolts down evenly.

Bearings weren't replaced. It was probably just the splined interface with the left crankarm which got some slight corrosion in it in the rain and started clicking. Nothing was loose either.
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Old 07-28-08, 08:02 PM
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which cranks? shimano or c-dale?
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Old 07-28-08, 08:02 PM
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lube your fork dropouts
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Old 07-28-08, 08:03 PM
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Old 07-28-08, 08:11 PM
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I just checked it again. I can feel it sitting on the bike pedaling backwards. Something is funky in the BB. I think the pitted bearing theory is correct.

Oh well. Of course the stupid bike is just fine until five friggin days before a TT. What a pain in the ass.
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Old 07-28-08, 08:19 PM
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Originally Posted by patentcad View Post
I just checked it again. I can feel it sitting on the bike pedaling backwards. Something is funky in the BB. I think the pitted bearing theory is correct.

Oh well. Of course the stupid bike is just fine until five friggin days before a TT. What a pain in the ass.
Would it kill you to loosen up the BB and squirt in bearing grease till you replace them with absurdly expensive/useless ceramic bearings everyone in Chesterville is using**********
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Old 07-28-08, 08:30 PM
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Originally Posted by patentcad View Post
I just checked it again. I can feel it sitting on the bike pedaling backwards. Something is funky in the BB. I think the pitted bearing theory is correct.

Oh well. Of course the stupid bike is just fine until five friggin days before a TT. What a pain in the ass.
I had a similar problem on my commuter recently, it was the BB.
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Old 07-28-08, 08:34 PM
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Originally Posted by spry View Post
Would it kill you to loosen up the BB and squirt in bearing grease till you replace them with absurdly expensive/useless ceramic bearings everyone in Chesterville is using**********
I don't know the Secret BB Launch Codes. Actually it's a Cdale BB, looks like you need some Top Secret tool like the ones in The Fifth Element.

Loosen up the BB. You guys crack me up. I'll get to that as soon as I drop the transmission in the Acura TL. You friggin pinheads. I pump up tires when I'm feeling technical. To me Greece is a place I go on vacation (I leave Aug. 19) not something I get under my fingernails.
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Old 07-28-08, 08:36 PM
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Can't I ride this stupid bike 70 miles with a rough BB? The crank turns fine. Or will this detonate and vapor lock on me mid-TT?
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Old 07-28-08, 08:37 PM
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^^ Get the BB serviced on your Ti road bike now too. Winter is coming
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Old 07-28-08, 08:38 PM
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Same issue with mine last year and believe it was left side as well. Was installing a new crank soon anyway and the click went away with the new BB install.
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Old 07-28-08, 08:39 PM
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Originally Posted by patentcad View Post
I don't know the Secret BB Launch Codes. Actually it's a Cdale BB, looks like you need some Top Secret tool like the ones in The Fifth Element.

Loosen up the BB. You guys crack me up. I'll get to that as soon as I drop the transmission in the Acura TL. You friggin pinheads. I pump up tires when I'm feeling technical. To me Greece is a place I go on vacation (I leave Aug. 19) not something I get under my fingernails.
let me quote you on this,"HTFU"
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Old 07-28-08, 08:39 PM
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Originally Posted by StupidlyBrave View Post
^^ Get the BB serviced on your Ti road bike now too. Winter is coming
Ti bike got a new BB in the Spring. That's fine.

'Do you ride in the rain'. Are you guys kidding? Pcad rides in friggin BLIZZARDS.
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Old 07-28-08, 08:40 PM
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Had a click at bottom of right pedal stroke - took off cleat, cleaned, dusted with graphite and remounted shoe, but not so tight (Speedplay Zero on Shimano shoe). Click went away.

May not be your problem, but it's a lot easier than breaking down (or just breaking) your BB.
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Old 07-28-08, 08:46 PM
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Originally Posted by SpongeDad View Post
Had a click at bottom of right pedal stroke - took off cleat, cleaned, dusted with graphite and remounted shoe, but not so tight (Speedplay Zero on Shimano shoe). Click went away.

May not be your problem, but it's a lot easier than breaking down (or just breaking) your BB.
Not the shoe/pedal combo, that came off another bike I rode today. Greased it anyway. It's the BB. I'm going to the bike shop in the AM. Good excuse to take a half day off : ).
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Old 07-28-08, 08:48 PM
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Originally Posted by patentcad View Post
Can't I ride this stupid bike 70 miles with a rough BB? The crank turns fine. Or will this detonate and vapor lock on me mid-TT?
I doubt it. However, after I pulled the cranks, I couldn't spin the old BB by hand anymore. The new one spun easily. Is this what you want on a Time trial?
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Old 07-28-08, 08:49 PM
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Originally Posted by patentcad View Post
I don't know the Secret BB Launch Codes. Actually it's a Cdale BB, looks like you need some Top Secret tool like the ones in The Fifth Element.

Loosen up the BB. You guys crack me up. I'll get to that as soon as I drop the transmission in the Acura TL. You friggin pinheads. I pump up tires when I'm feeling technical. To me Greece is a place I go on vacation (I leave Aug. 19) not something I get under my fingernails.
If you are going to have someone else fix it, don't worry about what is causing it. Take it to a mechanic, say "here, I don't want to get dirty," and pay what he charges you to fix it.
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Old 07-28-08, 08:49 PM
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Originally Posted by StupidlyBrave View Post
Is this what you want on a Time trial?
I'd like a secret electric motor in the BB. I may have that installed tomorrow AM.
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