VEXpro WCP SS Single Speed Base Kits - VEXpro 217-3421, The 2-stage WCP single speed gearbox from VEXpro has been designed to be one of the most versatile and easily adaptable gearboxes in the marketplace. Its mounting makes it simple to integrate into any drive train configuration while its parallel plate design and shaft layout allows for easy adaptation to any number of different gear ratios.The SS has two CIM motor positions to allow for multiple size pinions. There are 4 possible pinion sizes and gear kits, giving a total of 20 gear ratios. All of these can be swapped in without any modifications to the gearbox. This means teams can use any size VEXpro wheel and still have a wide range of desirable gear ratios without any additional sprocket reductions. VEXpro 217-3421 WCP SS - Single Speed Base Kit