LRP today announced the release of three rotors for their X12 brushless motors. The rotors are available in three diameters - 12, 12.5 and 13mm.
12.0mm rotor is optimised for maximum topspeed with a linear throttle feel. The preferred choice of the LRP team on big tracks with long straights.
12.5mm is optimised for efficiency and mid-range torque. This rotor is the perfect starting point for every setup on every track! Already succeeded with winning the 2008 1/12th IFMAR World Championship and 2009 1/12th European Championship. Also used by Ronald Völker to finish 2nd at 2008 IFMAR 1/10th World Championship.
13.0mm rotor is optimised for maximum torque and power. Recommended for short tracks with many acceleration parts or on tracks that are tough on runtime.
Source:
http://www.lrp.cc