The more I think about it, the more my options lean toward bike manufacturer's in the Netherlands and Germany: Santos, idworx, velotraum, Tout Terrain and the already mentioned above Koga and Rennstahl bikes... This comes from the perspective of a long-distance tourer and a bikepacker on the lookout for an almost fool-proof, over-engineered round-the-world travel bike... Santos and idworx, especially have some nice entries... Lately, I've been looking into idworx which seems like an excellent idea... Look at this beauty:
https://www.idworx-bikes.de/product/opinion-blt-e
Full specs [pdf]:
https://www.idworx-bikes.de/wp-content/uploads/2018/11/oP_BLT-E_1.0_18_10.pdf
Tests [just use Google Translate extension in your browser to read]:
http://www.sintchristophorus.nl/test-idworx-opinion-blt-multi-spec-e-bike/
If you speak dutch
Why I like it???
Pinion drive (C12 or P18), integrated rear-wheel drive that can be easily exchanged for a normal wheel, in emergency, or as needed, and still maintain gearing ability... Or upgrade the Z20 drive rear wheel in future as the tech develops further. Very important with this still emergent tech!!! Btw, I know Pinion energy transfer is a bit less efficient than Rohloff but it's a non-issue for me personally.
When I account for the weight of bottom brackets and Rohloff, the C12 Pinion drive isn't that much heavier, negligible differences, but it is more upgrade proof than most e-bikes with either Shimano or Bosch drives.
Can be ridden with empty batteries without losing pedaling energy. The Z20 rear wheel just becomes a heavier freewheeling hub... Not sure how this works with Bosch drives, or how effective it is??? Hell I can even carry a separate battery and charge it with solar while riding... Cumbersome yes, but possible... Then again, I could do it with all other systems, even with cheap Chinese motors
Water-'proofness' or resistance will be better than with mid-motor engines, and/or integrated into the frame batteries, I think...
Quality components, especially regarding carrying capacity... 40kgs rear racks and 15kgs front... I went to a local dealer and wasn't impressed with either the design or capacity of Riese & Mueller alu racks on their ebikes... From my experience, just looking at it, they are 'begged' to be cracked on routes I rode
Ability to order with SON front hub wheel to charge instruments, phones, and lights independently of battery. Greater range, too!!!
Why I have my reservations:
Expensive, but all the bikes in this category are usually expensive.
No dealers in the States. Big disadvantage because I'd have to import it myself and bear the significant costs and difficulties to import ebikes... Need to research it more...
I'll be in Germany later this year, so I might make a side trip and visit idworx and check it out, have a test ride, discuss the possibility of them shipping it to the U.S. and decide...
I might even just order a regular bike for commuting and when I'm ready for my BIG trip, which will be starting in Europe, just stop by the idworx factory and have it upgraded to the latest Neodrive tech in a couple of years...
Plus, the EU regulations limiting ebikes to only 25kmph might change, hopefully be bumped up, as I'm still able to bring a bike to that speed with my own leg power on flat roads, even such heavy beasts like Citibikes in NYC, approx. 45 lbs heavy
Not sure if Neodrives can be de-restricted to over the 25 kmph speeds for outside-EU market, officially???
Feel free to add and comment on your experiences with rear driven e-bikes, pinion drives, or any other thoughts. TIA
Btw, I'm leaning away from Pendix driven e-bikes as 1.) the Q-factor is too large for extended touring; 2.) can't use clip-in pedals due how the engine works and 3.) there seem to be some recurrent problems that would be too much hassle to deal with without a dealer network in the U.S. So, for now, this route is a NO-GO