Why the 4,5mm shaft you ask? Probably so they can sell a whole new rotor with a 5mm shaft to the buyers, or a whole new set of 4,5mm pinions

I hope the LRP stuff is "da bomb"! Named dynamic 8, I think they look almost like the orions and come in 1800kv, 2200kv, and 2600kv and maybe other kv's.
TG