The "FWF" that Frank used to sell from Germany is a Tongxin clone (lightweight small-footprint low-drag brushless hub motor with reduction friction gears):
EDIT: the link below is now dead, as Frank doesn't sell the Tongxin/Mini-FWF roller-based motors (too many returns, apparently).
Der Umbausatz
Well, it is actually manufactured by a company called Weifeng Machinery:
Weifeng Machinery Co., Ltd. - Front forks, brushless high speed wheel motors
The advantage over the Tongxin is the disc brake support.
Cheers, Daniel
EDIT: the link below is now dead, as Frank doesn't sell the Tongxin/Mini-FWF roller-based motors (too many returns, apparently).
Der Umbausatz
Well, it is actually manufactured by a company called Weifeng Machinery:
Weifeng Machinery Co., Ltd. - Front forks, brushless high speed wheel motors

The advantage over the Tongxin is the disc brake support.
Cheers, Daniel
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