Again, not sure what you mean when you write "wheels crooked by the notches." But to adjust your chain, you'll first loosen the nut up against the adjuster at the rear of your swing arm, then tighten the adjusting bolt to pull the wheel back. A little goes long way here. If by saying the wheel looks crooked you mean that it's off center, the two bolts can help you set it straight (and you can use a straight 2X4 or other straight edge to line up your front and back wheels to make sure they are in alignment). This stuff's in the manual.