Abstract: A trim assembly for riding lawnmower for trimming areas adjacent to lawnmower. The trim assembly for riding lawnmower includes a mounting attached to a perimeter wall of a blade shield mounted to a lawnmower. The device is positioned away from a body of the lawnmower. A cylinder is rotatably coupled to the mounting and orientated in a generally vertical orientation. A second pulley is mounted on an upper end of the cylinder. A disc is attached to a lower end of the cylinder. A belt extends around and frictionally engages a first pulley, mechanically coupled to a motor on the lawnmower, and the second pulley for rotating the second pulley and the cylinder attached thereto.