lol, I was calculating the rpms based on lipo voltages. RPMs using LiFe cells will be even less, and likely more of a problem. Generally, we try to shoot for ~35k rpm. So, if you are using 3s lipo, that's ~3100kv; for 4s lipo, that's ~2300kv; and so on. Just divide 35000 by the voltage you want to get the motor kv, then just pick the motor that is close.

do these come with 4mm bullet connectors or??