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Hi wingartist, you're right I didn't specify the OD. So for all the frame tubes, except the steering tube, the OD is 35mm. For the steering is 32mm.
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Yes, basically the main advantage is that you can have a traditional transmission. And, especially if you put on a high end Shimano grupset like SLX the feeling is like really nice (shifting and braking like on a normal bike). Regarding the weight, we have experimented with up to 120 kg. The most difficult part is the start, but once you're moving everything is more or less the same except for a different inertia in the change of directions. We have also tried an hydraulic steering damper and that improves things a lot when you travel around fully loaded. The steering feeling is a bit weird at the beginning but the bikes becomes really stable.
Thanks! After many trials we are quite happy with that system. It is easy to maintain, robust and the steering has a really "realistic" feeling.
REcycle - How to Build a Two Wheel Cargo-bike
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