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Had the bottom bracket replaced & still get annoying creaking sound under load especially in lower half of cassette & small ring, crank set has 15k+ miles.... bad bottom bracket or new crank set?

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Paul7189 [18 posts] 3 months ago
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Is it a press fit bottom bracket? If so then you can try removing the bearing cups, greasing them up and pressing them back into the frame. Its probably a job for a bike shop if you dont have the correct tools. Press fit bottom brackets are famous for creaking. 

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CXR94Di2 [1860 posts] 3 months ago
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There are many press fit conversion adapter s. They screw together to create a one piece bearing set, usually with replaceable bearings.

Or like many riders sick to death of pressfit BB bought a bike with good old English threaded bearings.

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jterrier [141 posts] 3 months ago
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Yep, consider investing in either a wheels manufacturing threadfit adaptor, or one of the enduro bearings ones. Both last lifetimes without creaking.

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Duncann [1158 posts] 3 months ago
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Is it definitely the cranks? I've never had it but I've read a few accounts of how crank-like creaks were finally traced to rear wheel skewers... seems odd but might be worth 30 seconds of your time to check/grease yours.

You may have a square taper BB -  the cranks' inner taper faces sometimes wear so that there's a bit of movement and creaking. It's difficulto to see and resolve (with light attention from a file) but might be worth removing the cranks and looking at how they've worn, then cleaning and replacing them. Whether the tapers should be greased is a matter I dare not raise (try Google).

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Goldfever4 [388 posts] 3 months ago
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Echoing Duncann, it can be surprising where the creak actually originates from. I've found success cleaning out my seatpost / seat-tube before.

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matthewn5 [1086 posts] 3 months ago
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Duncann wrote:

Is it definitely the cranks? I've never had it but I've read a few accounts of how crank-like creaks were finally traced to rear wheel skewers... seems odd but might be worth 30 seconds of your time to check/grease yours.

The creaks I had on my Colnago turned out to be the titanium skewers I'd added in. They don't grip the drop outs tightly enough. Replace them with proper internal-cam skewers. Noise all gone!

The other time it turned out to be loose chainring bolts. And another time the saddle squeaking on the rails. Hunt around!

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ktache [627 posts] 3 months ago
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I have had bottom bracket creaks that turned out to be seatpost creaks.  

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OR_biker [25 posts] 3 months ago
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I had gotten a thread-together adapter for my CAAD8 (BB30), but after a while the creaks came back.  I did some tests to try to isolate the bottom bracket (i.e. had wheels off the ground and pressed laterally on the cranks) and I was sure that it was still the thing causing it.  Then I finally got a new wheelset last week, and the creaking is gone...  go figure  1

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Duncann [1158 posts] 3 months ago
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OR_biker wrote:

I had gotten a thread-together adapter for my CAAD8 (BB30), but after a while the creaks came back.  I did some tests to try to isolate the bottom bracket (i.e. had wheels off the ground and pressed laterally on the cranks) and I was sure that it was still the thing causing it.  Then I finally got a new wheelset last week, and the creaking is gone...  go figure  1

QRs...?

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OR_biker [25 posts] 3 months ago
1 like
Duncann wrote:
OR_biker wrote:

I had gotten a thread-together adapter for my CAAD8 (BB30), but after a while the creaks came back.  I did some tests to try to isolate the bottom bracket (i.e. had wheels off the ground and pressed laterally on the cranks) and I was sure that it was still the thing causing it.  Then I finally got a new wheelset last week, and the creaking is gone...  go figure  1

QRs...?

 

I'm thinking now that's a possibility.  The older wheels are Fulcrum 5's and the skewers have external cams.  I have some extra Shimano internal-cam QR's from an even older set of wheels that are still in great condition (the QR's, not the wheels  1 ), if the creak comes back whenever I decide to throw the Fulcrums back on I'll try swapping those out to see if they help.

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drjohn [47 posts] 3 months ago
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I've had a creaky pedal thread in the past.

I used a more waterproof grease and Bang! the creak is gone...

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LastBoyScout [332 posts] 3 months ago
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One of my bikes has been making a creaking noise in exactly the same part of the pedal stroke. Turned out to be the pedal bearings.

I also have a suspicion the freehub is shot, as it's still got another issue with noise under load.

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n_g [10 posts] 3 months ago
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Since you mentioned the lower half of the cassette -- it's possible that the cassette itself is creaking. I had a creaking sound that I thought was from the BB or crank, but it was only noticeable on the 3 largest cogs of the cassette. It went away after lightly greasing the part of the hub that touches the cassette, and tightening the cassette locking to the proper torque.

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Simboid [95 posts] 3 months ago
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I thought I had a creaky crank or pedal, after an expensive service didn't cure it google suggested it might be my cleats. It was! Moving them inboard all the way got rid of it.

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LastBoyScout [332 posts] 3 months ago
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LastBoyScout wrote:

I also have a suspicion the freehub is shot, as it's still got another issue with noise under load.

It wasn't the freehub - rear mech was very slightly out. 1/2 turn on the adjuster and it's all good.