24VDC 250W electric bicycle motor with built-in gear reduction transmission. Gear ratio: 79: 11 (7.182). Motor speed: 2750RPM. Output shaft speed: 382RPM. Includes 9 tooth sprocket for 1/2" x 1/8" bicycle chain. Powerful four brush permanent magnet electric motor design. 100% ball bearing construction. 24" long power leads. Shaft rotation reversible by reversing power leads. Three bolts on front side of motor for mounting. Motor dimensions: 4-1/4" outside diameter x 2-3/4" long excluding transmission and output shaft, 4-1/2" long including transmission and output shaft.