http://www.hobbyking.com/hobbyking/s...or_3040KV.html
On the review of the 13.5t one guy says its the same as lrp x12 and assembles resembles the reedy motor. One guy say's the rotor is 12.5mm.
In the discussion of the motor it's mentioned that the motor is roar legal.
So hoping that some guy in here have some experience with this motor