The new TSR motor "The One" has a new design that reduced the length of wire while maintaining the ROAR minimum stack length. That reduces its resistance comparable to other motors in the wind class. 13.5, 17.5 and 21.5. The 25.5 ROAR motors are built to a specified minimum resistance number, stack length and rotor spec. With that in play the TSR design could not be applied to that class.