The combo comes with 6.5mm bullets. I have them on my ESC and motor. I like them. For my batteries and power wires from the ESC, I'm using deans ultra plugs.
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I didnt know the MMM came with the bullets attached....I am getting a medusa motor sent so I guess I will run the same size so easy changes can be made.
On the lipo connectors, I usually use deans. But had a buddy of mine that was running a bigger blue connector...seemed easier to handle in size and function. Maybe someone knows something comparable.