Recent content by urialbocher

Hi Dave, Great work. Can't wait to see some videos. You say "200lb person standing on the cranks= 200ft-lbs". Are you sure? I remember that the cranks are close to half a foot long which gives half that figure. Uri

You are confused :D In the first link you need to read into text. Fourth paragpaph: ".... Now we have also developed a helical gear, extremely quiet gear. Experiments with different helical gears have shown that the efficiency is slightly worse and consume little more capacity, but much...

I have some experience with this motor too. I have two 24V versions - one 250W and one 450W. Both are equally noisey. The noise comes from a combimation of the straight cut metal gears and the motor's RPMs. I see some e-bikes with this motor exactly that seem to make less noise than mine. I...

Some serious reduction in that gearbox. Worm gear maybe?

Hi Whiplash, I think, though I am not sure, that the noise is mostly related to the motor gears and less to the type of drive (mid vs hub). I think that many hub motors use nylon gears which are far less noisy. Specifically for the my1018z motor, it has metal gears with straight teeth - the...

I got about 1000 kms on this new crank setup. I was a bit concerned at first about dirt getting into the roller clutch and messing it up, but so far so good. The roller bearings appear to do their job and no slack has developed in them. I was also a bit concerend about the clutch mechanism...

It's a tough question to answer since it depends on so many parameters (wind direction, tire pressure, battery condition etc.) which I never actually tried to monitor. I have the 250W and the 400W versions of this motor and I think I would say that the 250W would give roughly 28kmh and the 400W...

Hi all, This build started some time ago, working on it on and off, mostly off. I have been riding full suspension mountain bike for roughly 10 years and always wanted to add a small motor kit to make the ride more fun. I wanted minimum changes to the bike and so the goal was preserve all 27...