Endless Sphere

A concentric drive won't have any anti-squat behavior during acceleration which reduces traction, especially on rough ground.

Lightweight motorcycle with pedals vs powerful ebike.
I actually wouldn't want a concentric drive, especially not shared with the pedals. You lose the ability to control squat.

Measure the frame then 3D print cell holders which snap around it with the cells arranged radially.

Put all the motor mass into either a big hub or big mid-drive. Running both gives the worst of both without any advantages.

There is an EV offroad racing championship going live this year:
https://www.extreme-e.com/

They ran the last stage of Dakar as a demo.

To be clear I'm talking about grassroots motorsport: AutoX, karting, MX, cross country motorcycle and similar. The kind of thing people do as a hobby. I remember karting in mall parking lots and riding crosscountry motorcycles practically in town. People didn't used to consider silence a right. Thos...

Both are low on the totem poll, motor sport events are usually in out of the way venues, except for the monster truck series which is in the same stadiums sports are played because they are located in centrally located areas with access via mainline transit routes. Race tracks are almost always on ...

A very marginal battery could end up not working at all after losing just 20% capacity. So cutting it really close could result in a very short usable life span. Then again from what I understand once you've taken off a sail plane can climb very efficiently. Throttling down once you've reached a saf...

Finding a way to eject the pack in event of a fire is much easier with the smaller pack.

Keep in mind that using Lipo at high drain will reduce pack life way down. But then again how many flights per year are you going to get?

I think EVs are the only thing which will save motorsport from both noise and pollution concerns.

If you are doing any jumping you'll break the BBSHD bottom bracket.

Hello everybody, after reading a lot about ebike conversions and failing to find a satisfying solution to convert my all mountain bike because of battery placement problems, I discovered the Frey brand thanks to this thread as a value for money option featuring the powerful Bafang M620 motor. So no...

Skip the bicycle freehub if you intend to push any real power. Just get the extremely robust and inexpensive Oset hub which has a 6 bolt pattern on each side, they sell a spider to mount kart sprockets directly from there.

BBSHD won't do what you want and a hub won't either. You need to consider the Lightning Rods LHD or a similar build.

They also make direct fit sprockets and carriers to mount kart sprockets. Super useful parts and relatively cheap.

I had a big reply typed and it didn't post. Basically the weak point in a chain is the rollers. They are the same width for all multi speed bike chains. Only the side plates are different and those don't typically wear. The ebike specific group sets use 11 or 10spd chains and spacing with fewer cogs...

An OSET hub is probably easier and built for the task:
https://shop.osetbikes.com/hubs

The issue is the unsprung weight of the hub. Any offroading will be severely compromised.

Modern ebike specific 10 speed stuff is stronger than cheap 7/8spd.

How much offroad use do you expect?

I mean no freewheel at all. That part is to mount a freewheel onto a brake rotor mount, or so it looks.

I would run a fixed rear gear with that much power. Any freewheel will be both a source of failure and also impair how precisely the power is applied. Modern controllers can provide a virtual freewheel for coasting if needed although personally I'd rather have a little engine braking.

Dishing wheels is very common on motorcycles, shouldn't be a problem.

Likewise running a smaller front tire is the norm on motorcycles. A regular 29er would probably work.

Way too expensive for a 26", worth maybe half that. Also no real point in using a full suspension bike if going with a hub motor. Why isn't full suspension compatible with a hub motor? The unsprung weight of the motor makes it unsuitable offroad. By the time you modify the suspension to handle...

Way too expensive for a 26", worth maybe half that.

Also no real point in using a full suspension bike if going with a hub motor.