We're excited to announce the release of our new Actobotics gearmotors with encoders. Offered in 11 different speeds ranging from 27 RPM to 2,727 RPM, you're sure to find the perfect motor for your next project! $49.99
https://www.servocity.com/html/3-12v_planetary_gear_motors_wi.html
These 3-12V Precision Planetary Gearmotors are equipped with dual ball bearings, full metal gears and 3 PPR Magnetic Encoder.
Compatible accessories include: Hub Sprockets, 4mm Clamping Hubs, 4mm Set Screw Hubs, Disk Wheels and 4mm Pinion Gears.