[captain harlock]

Where are you going to use the setup first? then gear it as a standard brushed motor(as you would with a 9-10T motor) then you can gear it higher from that point. The 5300 will deliver you much more torque than a traditional brushed motor, but its better to treat it as a brushed motor at the beginning and when you feel that it needs to be faster just use larger pinions or smaller spurs and remember not to over do it.