26" vs 700c

Just to be devil's advocate,
Im surprised noone has mentioned how the wider (135mm std) rear end on mtb frames dictates a wider/larger/higher q factor which might detrimentally effect pedal clearance.
As mentioned in my earlier post, pedal strike is not an issue and that's using 175mm cranks with wide BMX pedals.
Additioanlly The Euro, spanish or mid BB used on a street or DJ MTB uses exactly the same length BB axle as all of the modern 700CMX frames.