600 miles, so far, with my 20mph adapted "Trailz".

Forgot to mention, when I swapped the freewheel, I checked the lubrication in the motor, it was properly lubed, with some extra! Motor sounded slightly different, recently, so I pushed bike backwards, spinning motor in reverse, and I believe it redistributed some of the excess onto the gears, sounds better now!...???
Will, of course, visually check, soon.

New batteries are working well. I have a fair bit of power left after my 20mph 10mile jaunts. I will confess, in this hot weather, I've slowed down near the ends of my rides, too cool off. (15 -18 mph for the last couple miles.)

No problems. I adjust brakes and check tire pressure weekly, as well as monitor motor temperature. I don't think there is any problem running the 16T freewheel @ 24V! Getting up to speed is more work, but the extra speed is well worth it!

However, I recommend the upgrade as an electric assist, not as an electric bike. Bike cruises nicely @ 20mph but struggles to get there unless you help, (with pedal power).

PS My "pedal assisting" seems to be working, in the past few weeks, I've gone from 208, to below, 200lbs! My thighs & butt are noticably trimmer, and I can see muscle "definition". I've even thought about shaving my legs.

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EZip Engineering 101