Reedy have introduced a range of optional rotors for their Sonic 540-M3 line of brushless motors. Available are 12.3mm, 12.5mm and 13.0mm modified as well as 12.0mm, 12.2mm and 12.5mm spec rotors that help to fine-tune the characteristics of the motors in terms of peak RPM and available torque. Each rotor is laser-etched with its specification and part number for easy identification and technical inspection. Included is also an assortment of spacers to adjust the rotor’s position within the case.