Abstract: A motorcycle with enhanced control of a vehicle body is disclosed. The motorcycle includes: a body frame; a rear arm with an elongated hole formed therein; a rear wheel; a shaft; an adjustment mechanism for adjusting the front-to-rear position of the shaft; and a fastener member for fastening the shaft to the rear arm. The adjustment mechanism includes: a first cover member having a first insertion opening formed therein and facing one of the sides of the rear arm; and a second cover member having a second insertion opening formed therein and facing the other one of the sides of the rear arm.