Help! Knocking noise from the motor / freehub after 1500km

novadriver

Just Joined
Jun 19, 2021
4
1
After 1500km my rear hub motor with cassete freehub started making a knocking noise. Using headphones you can hear it very well.

I think it is the freehub and not the motor. The noise happens when the wheel is spinning freely and almost doesn't when the freehub is engaged. In the second video I only spin the pedals backwards and the noise still happens.


What is broken?
 

Nealh

Esteemed Pedelecer
Aug 7, 2014
14,540
5,638
58
West Sx RH
Freehub bearings or freehub loose and the threaded retainer needs torqueing up.

The second film was a bit dark but to me it looks like the cassette is wobbling a bit so I would first check the threaded retainer.
 
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Nealh

Esteemed Pedelecer
Aug 7, 2014
14,540
5,638
58
West Sx RH
When it comes to noisy cassettes there aren't too many causes available.