Fixed ratio 42mm epicyclic geared motors re 975 mfa 975d41 epicyclic metal gearbox 41 gear ratio planetary gear 6 to 12v voltage rating 413w power rating 7000rpm no load speed 5700rpm maximum speed 55a load current 5000g cm maximum continuous torque 15000g cm stall torque 446mm diameter 8mm shaft diameter 1205mm long 541g weight robust unit boasts a powerful high quality motor sintered bronze bearings high torque transfer from the motor to the gearbox efficiency can be