The distance between crank arms, i.e. the Q Factor, is notoriously wide on most fat bikes. While that’s not a huge problem most of the time, you’ll end up with sore knees, hips and ankles due to the altered geometry of each pedal stroke. Over thousands of pedal strokes, that adds up. The Otso Voytek has a more narrow Q Factor so your pedal stroke geometry is much closer to that of your mountain or road bike fits.