Early MTBs used cut-down MA2 rims (13.5mm internal width) and ran 2" wide tyres on them without problems. My touring bike has been running 38mm wide tyres on MA2 rims for years - never had any problems with that - and at the other end of the scale, I have some DT Swiss XM401 rims (22.5mm internal width, according to DT intended for tyres up to 2.5" wide) on which I've been running Schwalbe G-One 30mm wide tyres without problem.
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