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Thanks a lot for your quick reply. Very helpful!
Yes fender space is a concern. If you look here: http://www.nolifelikethislife.com/byexpressen-omniumcargo/
Looks nice and quite functional but no fenders...
I wonder what is the difference between a 650b+ 2.00 wtb and a 700c marathon with max width 1.5 in terms of compromise between speed / confort / stability of load... In you experience with narrow tires such as the one you have, how do you feel the ride is? But yes 700 has much more choice. What do you have in the back and how do feel about it? Thanks again
stefunlekite-
A local mechanic runs a 650b horizon with a mudguard, I'll take a picture when I go the shop next.
IMHO the front end being a little harsh it's good to go for a bigger volume than the stock 28c tyre. How big is a matter of choice, 1.5'' to 1.75" gives a nice tyre profile that suits me. I have a 32c at the rear on a 29er rim and I don't feel I need anything bigger. I never had an issue with grip, I'm not slow either. Don't overthink it. I might check that Arisun tyre at the Omnium shop though.
Lolo
Got your PM! I'm afraid I can't really help you with the BMX tyres, as I have no experience of them. I'm currently running a Continental Contact (37-406), measuring about 40mm on the BMX rim. It's not the most compliant tyre, but it's impressively tough (not far off a Marathon Plus, at a fraction of the price). I wouldn't fit something too racey, it should remain practical after all (saying that you can now buy a Schwalbe G-one). I'll probably go a little bigger size-wise for the next front tyre, but the stock mudguard is quite narrow so I'll have to look into that. For the rear I'd stick to a 700c if I were you, as there's so much choice tyre-wise. Saying so a 650b WTB Byway should fit (it does on the full fat cargo).
Unless you live somewhere very hilly I wouldn't worry about the motor. It's a very capable machine, the massive downtube also mean it's a stiff frame.