The motor I'm using is rated for 12v, plus the gear ratio I'd need for higher voltage is just not available.

Anyone else?

What is this monster motor you plan to use? A 12v system is likely to fry at low rpm if you are wanting any decent power.



Gear ratio is always the problem, which is why I use hub motors. But, I have one of these coming that will make a Nue 1915 1y hit the perfect speed on a 26" bike.

It's a CIM FIRST robotics motor. I'd like to use 24v 10Ah but don't really want another reduction...
PS that gearbox is very cool

I added some info to my last post.


Give it a shot, but it probably won't do too well on acceleration. Maybe lace your rear into a 20" rim to get more reduction? The delrin gear will probably wear fast too.

Sent you an IM. But you replied... Wow quick!

the acetyl gears will hold up fine- we use them on our robot and they work fine without wear.

I'm worried about the Mod1 reduction gearing--I can't see it holding up to 200lbs of rider and bike--even though the reduction will lessen the direct torque applied to it. Can you find a mod2 combo that will work?

I will be riding some mod1 gears here soon. We will see how they hold. The problem was finding mod1.5 or 2 gears for a 5mm shaft.


it will be interested to see how the ebike world changes in the next few years.