We ran 6 CIM motors through
this VEXpro gearbox at 6:1 reduction, the standard KOP belt system, and 4" wheels. Worked great for us, no issues whatsoever all year. When we increased the weight up to 120 + 20 for bumpers + battery and installed traction wheels, the motors gave us that little bit of oomph that we needed to power through to the feeder station. If we were in more sustained pushing matches, we would have found ourselves more at risk of breaker tripping.