i use a 1515 1y 2200 and id say the lowest u could really go is 12 and even then the center brace may need to be shaved to let the motor clear on the backside, i reccomend hotbodies truggy ring and pinions so then u have more gearing options running a 46t spur.
Losi Muggy
medusa 36-80-2000kv
6s turnigy 30c
MMMV3
46ts/ 14-16p
spektrum radio