Originally Posted by
FastJake
Although I've never tried it, I think a 12mm offset would be horrible. Adding 12mm to each side with a pedal extender? That sounds worse. A while back I rode a spinning bike with a large q-factor (didn't measure it) and hated it.
Pfft. Then skip the power meter and just ride more

I see your point on wider q-factor.
But, after you mentioned it i measured q of cx bike vs mtb. Mtb is a little over 1" wider @ 7" while cx bike is a little under 6". I couldn't believe the differrnce & double/triple checked it. I never noticed the difference going on 2hr+ bikes including 300 mile road tour on cx bike