Originally Posted by terry.sc
Who races 21.5T outside of F1 and USGT which are a tiny minority of racers compared to all the other electric classes. No ROAR class uses them.
The cost of submitting a motor is pretty substantial because as well as the $350 fee and three motors, ROAR also wants proof that you have substantial stock as well. The old approval form used to also ask for proof that you had a minimum stock of 2000 motors of each type you submitted.
ROAR is the US RC governing body
Out of curiosity, why would this concern you ?
There are many 21.5 approved motors on the list
Perhaps you should enquire with those mfg's about why they went thru the process ?