Mountain Bike Reviews Forum banner

Bimotal electric motor for MTB

7.7K views 15 replies 14 participants last post by  Buddha43  
#1 ·
What do you guys think of Bimotal electric motor to convert regular MTB to E-Bike?
This motor is attached to rear disk rotor to move the bike.

 
#3 ·
I don't think many frame designers are going to be excited to see so much mass mounted on such a long lever arm away from the brake bosses.
I see that they advertise torque but not power. Their product needs more torque than a mid-drive system since it does not use the drive train as a gear reduction. (I don't think mid drive through a bike drivetrain is a good idea either)

I think a front wheel hub motor makes more sense than this contraption.
 
#4 ·
Good idea. Not clear about nm produced. It stated 2nm in earlier version, then 85 nm in some kind of simulation.

Need weight info, that will address if it is too much weight on 2 bolts meant for disc brakes. My suspicion is that with decent weight, bouncing this thing in a typical rock garden is going to damage the frame pretty rapidly.

Good beta concept though.
 
#5 ·
My bro-in-law has had one of these on order since they launched their kickstarter or go-fund-me or whatever they did to get started. Seems like he's been talking about it for a couple years now (or maybe I've lost track of time) and he still doesn't have it.
 
#6 · (Edited)
Do they explain how this thing even works? The pics look like it sits on the brake rotor? WTF?

EDIT: Oops, Never mind. I found the pic that shows the drive gear attached to the rotor.

I do wonder about using a post mount for an application that has the force going in the opposite direction than it was designs for.
 
#11 ·
I don't believe those disc brake posts were intended for a motor. That being stated, the drag from this set up would be noticeable.
 
#13 · (Edited)
Thanks! Wow, didn't realize how easy it is to attach & remove from the bike.
I'd like to see a vid of the thing in action, not that it would tell us much.
=sParty
That is expensive! $2,000!!!! (And it is a class II engine, with a throttle, that should not really be discussed here.)

If you want an easy city conversion get the Rubbee X – Make Your Bike Electric In Seconds. It is much cheaper, as easy to install as it gets, can be removed in a blink leaving your bicycle unchanged, and works very well with a cadence sensor.. Will also work on smooth gravel. Not really for trail riding, but in my amble opinion you should not really take motored-bicycles on trails other than fire roads, and only if they are already open to engine-powered vehicles. So no big loss there anyway.