my maxx is right about 12 lbs.
i finally got a chance to run it a bit with 1515/1Y on 6s.
first off, i'll say this:
6s geared for 40mph seems WAY faster than 4s geared for 40mph!
motor did run a little hot that way and system is much more balanced geared for 50mph.
geared it for 55mph and haven't been able to hold full throttle yet. even after two 15 minute runs. need more room.