https://www.ride.it/en/dc-gear-motor-diameter-4239-gml4239x45-25-z1/
Dc Gear Motor Diameter 42/39 GML42/39x45-25-Z1
Diameter 42mm DC gear motors, stronger version, interaxis 25mm, left gearbox, no-load RPM range between 120Rpm and 30Rpm.
dc gear motordiameter