Click when left pedal pressed down on Trek/Bosch

I’ve never heard that but I’m curious which Trek? I’d try a different pedal.
 
Did you grease the pedal thread and crank mounting surface? Oddly, it can also be the seat mount. Tighten all the mounting bolts under the seat.
 
Alan Acock said:
Click on down stroke of pedal. Trek/Bosch. Everything has been adjusted.
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Check to see if some debris like a pebble or gravel is stuck in the cranks. I’ve seen people have this exact issue on e-mtb forums. Once debris found and removed noise goes away.
 
Check the torque on your crank bolts & pedals. Both can cause this issue if even slightly loose.
 
Does is happen back pedaling? Perhaps you could remove the pedal and crank on that side and turn the other side and see if it is the motor turning or it is the pedal or crank.

I had a problem of a click intermittent and it was the pedal.
 
I've had a similar irritating noise on two bikes. On my Cannondale mech bike is was a slightly loose headset. It had passed the usual 'set the front brake and push the bike' test but I was able to confirm this by riding hands free. Tightening the headset just a bit solved this one.

On my ebike it was one pedal. I confirmed this as the noise stopped each time I stopped pedaling. It could have been something more serious, but it wasn't! One pedal needed lube. I disassembled both pedals and found one to have dry bearings. Another odd problem solved.

Good luck with yours, and Ride On! 😎
 
Silence is golden! I hate noises like that, and have found myself chasing my tail to find them more than once! I have found the loose pedal issue, loose crank arm, loose seat post, and the last one turned out to be the damned seat itself! I found that by leaning on the bike while checking other "stuff". It made a sound similar to a "click" I was hearing, and it dawned on me that the seat might actually be making the mechanical clicking noise I heard with every down stroke of my right leg. The "click" I thought I was hearing turned out to be a "squeak" coming from the seat! -Al
 
It wasn’t the headset. Not the seat or post. Not the pedals. The problem was the bolts used to mount the motor were no longer properly titled.
 
Alan Acock said:
It wasn’t the headset. Not the seat or post. Not the pedals. The problem was the bolts used to mount the motor were no longer properly titled.
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Sure! You could add those to the list of likely suspects as well! Nicely done. Thanks for updating the list!
 
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