If you ride a motorcycle you should probably get one of the alignment tools to be sure your rear wheel is parallel to the road.
Here I propose an affordable yet precise tool to align the wheel of the bike. It consists of a tiny laser mounted on a PCB which serves as a pivot point.
Put a 9 volts battery and proceed as described in the picture below. Put the tool against the rear sprocket and rotate the tool. During the rotation keep the tool perpendicular to the sprocket. The laser will follow the chain from the sprocket up to the gearbox sprocket. If the laser spot is situated at the same distance along the whole path then the rear wheel is aligned correctly. If not, align the rear wheel.