Kicking things off, I want to point out just how much Rubbee will cost you; no more than €580 ($620 at current exchange rates). That's it. That's all you really need to get into the e-bike game. Sounds too good to be true? Maybe it is, maybe it isn't; you should decide once you've gotten all the facts.
Now, I've mentioned that Rubbee is a bit different from other kits you may have seen. Why? Well, it's a self-contained unit that requires no complicated mounting, nor do you have to take your bike apart to get things moving; the X simply mounts to the bike's seat tube and applies pressure onto the rear tire. That's friggin it! Just mount a bracket to the seat post and install your X.
Once you've mounted the bracket onto your seat tube and clicked the X in place, lower it onto the tire ad watch the magic happen. Instead of being mounted directly into your bike's hub or BB bracket, the Rubbee is simply set onto the tire, upon which it will proceed to spin following the assistance level you've chosen. However, the amount of power your X can put out depends on the number of battery modules you have inside.
As a base model, only one module or pack is available, and it's enough for a top speed of 16 mph (25.7 kph) with 250 watts of power being pushed out. With three modules, the maximum allowed, you can hit 20 mph (32 kph) speeds, crank out 350 watts of power, and it is applicable even for off-road use. However, with three modules, a range of 30 miles (48 kilometers) is your limit. For two, it's 20 miles (32 kilometers), and for one module, your range is a mere 10 miles (16 kilometers). But, at least charging only takes up to one hour per battery pack.
All that's left to do now is give ol' Rubbee an e-mail to see if I can get my hands on an X myself; I'm dying to test this thing's limits and see what 10 years of R&D can lead to. Wish me luck!