I'm not that sure actually Jimmy to be honest, I got the kV rating from the Tower website, but I've just spotted now that they have the 1, 2, 3 and 4*'s all rated at 6500kV in their descriptions
Novak give kV ratings on their motors, assuming the Reedy/Novak motors are similar speeds...
Novak Reedy kV
3.5 - N/A - 10500
4.5 - 4* - 9000
5.5 - 3* - 7400
6.5 - 2* - 6400
I have NO IDEA if those are correct, just an (un?!)educated guess.
:::edit::: Mr Doughty to the rescue
My guesses were'nt too far off
