Skarper conversion kit is interesting.

[Jimmy666]

Looks like a class 1 kit but not sure how the PAS works and a downside is the internal battery but it looks like it is half the cost of the Bimotal witch is similar. I like the idea though.

Skarper - eBike. Transformed

An eBike in One click. Transform any bike into an eBike in one click. High performance and flexible eBikes for everyone.

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[mikeschn]

So they mount a motor on the rear brake mounts... I can't imagine there's a torque sensor anywhere in the system. Heck, I don't even know if there are any rear brakes. I still prefer torque sensor mid drive stealth systems!