I have just found a new European maker, Ride Unlimited, based out of Barcelona. Interestingly they produce both complete e-boards and units to convert existing decks. Three models, of conversion units, are available (pre-order for spring 2018 right now): a “Solo” single hub-motor and battery unit, single hub-motor but double battery “Cruiser” unit, and a double battery and hub-motor “R” unit.
The Solo and Cruiser units, with the single motor, looks on paper low-power rated with a max of 840W. The faster R unit, with the double motor, has a more respectable max 1680W, but still not matching the top performing units on the market. In the end, however, only real-world riding will tell how they perform and what is fast enough or not.
What is interesting, besides general design including replaceable hub-motor polyurethane, is that they are specifying IP65 dust and water-resistance (rated as: “dust tight and protected against water projected from a nozzle“), like the similar focused Mellow and Onan units.
Vlogger FabTrav (Fabian Doerig) trying a unit out at the ISPO 2018 Exhibition: YouTube Link