I have a Giant Esprit Twist Power electric bike, which apart from not having nearly enough words in its name also has a problem related to the crank.
When I put a lot of load through the pedals there is a loud clanking sound, once per pedal-press. If, as I cycle, I press with just one foot (and just lightly follow-through with the other) then I get the noise once and then not again until I start pressing with the other foot. This suggests to me that the problem is related to something shifting position in response to the side of the bike on which the pedalling force occurs.
Curiously, although the noise is extremely pronounced, I don't think I can feel anything.
There is no play I can feel in the bottom bracket, and likewise the pedals seem to spin smoothly.
The torque-sensing chainset arrangement seems like a possible source for the noise, I'm just not sure how.
So I guess my questions are...
- Can a bottom bracket bearing make this kind of noise without feeling rough or loose?
- Does anyone have any advice to offer about this kind of torque plate?
Here is a picture of the dismantled torque-plate:
Thanks in advance!