Extended crank set keeps slowly unscrewing no matter what I do, causing wobble and looseness in the pedals.

Deliveryfoot

New Member
Joined
Sep 3, 2020
Messages
21
New update:



It's hard to see, but it seems the bearings are digging into the shaft itself. Creating a pit and valley. I use the lowest gear possible, but i do a lot of hard and heavy pedaling from a dead stop, especially uphill. I bought a spare crank set expecting the worst and luckily it paid off. So i replaced nearly everything. The cups inside seemed perfectly fine.

I took the advice of park tools here and pulled the bearings from the cage and shoved them in with grease like in the video

And as i began testing new parts, put it through a bit of a torture test, though no different from if i had to pedal on an incline at a dead stop and it immediately began "loosening". And my understanding is such, the shaft is cheap chinesium and is pitting under the pressure of the bearings from the strenuous pedaling.

Please, if anyone can recommend a good website where i can buy a new high quality extended crank set in canada, please let me know!
 
Last edited:

Chainlube

Well-Known Member
Joined
Jan 5, 2020
Messages
3,784
New update:



It's hard to see, but it seems the bearings are digging into the shaft itself. Creating a pit and valley. I use the lowest gear possible, but i do a lot of hard and heavy pedaling from a dead stop, especially uphill. I bought a spare crank set expecting the worst and luckily it paid off. So i replaced nearly everything. The cups inside seemed perfectly fine.

I took the advice of park tools here and pulled the bearings from the cage and shoved them in with grease like in the video

And as i began testing new parts, put it through a bit of a torture test, though no different from if i had to pedal on an incline at a dead stop and it immediately began "loosening". And my understanding is such, the shaft is cheap chinesium and is pitting under the pressure of the bearings from the strenuous pedaling.

Please, if anyone can recommend a good website where i can buy a new high quality extended crank set in canada, please let me know!
Caged bearings are a different size than loose bearings, loose balls need to be bigger.
 
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