Originally Posted by
Poppin Fresh
It's a tuned N21BF by Massimo Fantini. RCAMERICA is their primary distributor, but you can correct me if I'm wrong.
i do recall the specs stating that the M3 crank is 14mm vs the 13 mm of the N21BF but that could have been a typo...
Isn't the Rb Concepts S3 the same as a N21bf ???