An individual cartridge for the UltraPlanetary System. This cartridge is nominally a 4:1 gear reduction.

The UltraPlanetary System is a cartridge based modular gearbox designed to handle the rigors of the competition and the classroom. Building on the ability to iterate and adjust designs easily using the REV Building System, the UltraPlanetary System consists of pre-assembled and lubricated cartridges allowing for swapping gear ratios on the fly and with ease. Users can configure a single-stage planetary using one of three different reduction cartridges, build multi-stage gearboxes through stacking individual cartridges together, and choose two different ways for transferring power through the output stage through face mounting to the stage or choosing the length of 5mm hex shaft best suited for the application.

The UltraPlanetary has a variety of options for mounting with six different brackets and spacers available for mounting to REV 15mm Extrusion, REV C Channel, or REV U Channel.