This is a rim I really like. It is 35mm wide (30mm internal width) and 590g. It is very stiff. Unfortunately it is not asymmetric which make it perfect but the symmetric extrusion does make it useful for builds with a dynamo front hub like this one. 

I actually have been riding a set for a couple of years on my single speed 29er. I fitted 2.3" geax Gato tyres which I run tubeless. Setup was easy and while the wheels are not light I really dont care as I use them in winter when the main drag is the wind, cold and mud.

Of course if you are a heavy rider there is no better MTB rim. You can do XC on them, DH, enduro or whatever the latest niche is. But dont think these are restricted to MTB use only.

As the rims come in 26", 27.5"/650B or 622/29er size they have other uses. Tourists wanting to run wide tyres in a 650B wheelsize have rim that can handle whatever load they want to carry. Ride over any terrain. 

This set has been built with a SP PD-8X dynamo hub and a DT Swiss 350 hub for the rear.

If you want a robust tubeless compatible rim for touring (with wide tyres), MTB or expedition use then this is your rim. I actually think it is Velocities best rim. 

Rim available here

http://thecycleclinic.co.uk/products/velocity-blunt-35-disc-brake-mtb-rim-29er-27-5-650b-or-26

http://thecycleclinic.co.uk/products/velocity-blunt-35-mtb-or-touring-expedition-wheelset