This gear motor wheel is perfect for your next robotics project. This gear motor is ideal for robotic car or line-tracing robot. With plastic construction and colored in bright yellow, the DC gear motor measures approx. 2.5 inch long, 0.85 inch wide and 0.7 inch thick . The wheel can be mounted on either side and the gearmotor works well between 4V to 7V (recommended 6 Volts). At a ratio of 1:48 you can get some really good torque at 5 Volts.