Yeah I can get up to 40 on the flats. got it to 44mph on a slight down hill grade once.. but I didn't want to go any further.
I can get up to 35 on pretty steep hills... I'm pretty happy with this figure. Though that's pulling 2500-3000W the whole hill. I'm seeing practical efficiency around 36Wh/mile, with very little pedaling.
In regards to vibration, the controller is heatsinked and screwed on to the enclosure, which is in turn attached to the frame very securely. Should the controller sit on bushings? The batteries are very snug.... there is not much room for things to jiggle around. critical gaps receive some old intertube rubber, and the sub packs are velcroed together. The 8S on down tube is sitting on .1" thick, 2" wide rubber.
Yeah, one of the reasons why I'm considering making my own gear is that I like to sit around 25-35mph, and the lowest the high quality white industries freewheels go is I think 15T or 16T. The cromotor can't accept a multi speed freewheel, and I'm not interested in the complexity of a derailleur system. My current crank is a very high quality one that I don't really need, but I can't justify getting rid of it just to put on a larger ring. I think the largest I can buy for this 108-115bcd (can't remember) is around 50T. It might actually be fine for my purposes, cause you're right in saying that ebikers generally should pedal less over 30mph so as to prevent loss of control.
A side benefit is that a CNCed gear is about 5 hours of my time and about $40 for the 12x12x.125" 7075 sheet... which could be less than a commercially available chainring.
I also may be milling a spacer to get optimum chain alignment with the cromotor. I don't have my hands on it yet to know
I just got a spell check telling me that cromotor should be cremator
! Maybe that is more appropriate....