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I have a worn-out 5" hole saw too, and an old Porter-Cable freehand router. Since it has a universal motor with commutator & brushes, it should run on 90VDC and spin pretty close to the rated 12K RPM. Which would seem to cover about one mile in... four or five minutes? A disappointing 15-20...

In which case, maybe keeping a spare set around would be at least of psychological benefit. ;-) Thanks. BTW, anyone who can drift through corners while laying rubber on this kind of bike must be a magician. It's got all the blinding horsepower of a cordless drill.

I figured DD motors would be all about top speed on level ground with Twiggy aboard. My e-Townie has a planetary hub, and the biggest concern is that they're plastic gears. Which I suppose may or may not be a bad thing, depending on whether it's plain old nylon or some exotic variation of...

. . . motor/hub gears: Has anyone around here taken a stock Townie 250W hub (or similar kind of thing) apart and noticed whether the planet gears are plastic or metal? Would plastic ones be plenty reliable enough and have a decent lifespan when driven by a low-powered motor like the one I...

I've had a few mixed experiences with cheapo funny-name Amazon entrepreneurs. Fairly happy with my cheesy little triode tube phono preamp now, but it required some easy mods (mounting inside a heavy Faraday cage) to make it quiet enough for my purposes. That is a nice-looking kit you...

I can do the dropout/fork reinforcements no prob, and may even prefer to fabricate them from scratch with some nice aluminum alloy bits from my scrap heap. I have always wondered, though, what all that constant pulling force might eventually do to the headset bearings. Also the extra unsprung...

Danke. I'll give that a look.

I was starting to suspect that the pulse generator is situated within the hub, which would seem to involve a ridiculous amount of engineering to relocate. In which case an aftermarket kit may be the only option, since I find speed control by pedal force much more useful than a manual throttle...

Eddy here. Tinkerer and recent secondhand-but-mint-condition Townie e-Electra owner, as of too late last year to ride much. Also have a nicer 9-speed one, with which I'm thinking of taking the plunge with a conversion kit. First impressions are "Holy cow, this thing is way more fun to ride...

. . . some slightly geekish DIY electromechanical engineering questions for you wrench-and-voltmeter-wielding risk takers out there: Old(er) age, a fixed income and the need of exercise having reduced me from midlife-crisis crotch rockets to sedate e-cruiser bikes, I have one definite project...