Originally Posted by badbikemechanic

Don't do it. Mountain bikers tend to spin naturally on the trail due to the nature of riding single track. This is why mountain bikes utilized more gears in the past, and have lower gear ratios with the doubles. Roadies spend allot of cash on gimicky technology like q rings and do lame training techniques like 'isolated leg training' trying to 'smooth out the pedal stroke'. This is something that comes naturally to us. You can try it yourself next time you are out there- try to make a climb in too hard of a gear and see what happens.