about two years ago, I had already finished.
my X1CRT run up to 60mph.
Quark 125B
A123 6S2P
HACKER 8XL motor
20T/52T
XTM tire

Here is video http://www.youtube.com/watch?v=HM5UvmiRccg

i think truggy can easy up to over 60mph with MMM 6S.