there is nothing to control the legalness (is that a word) of speedo's so any speedo is fine.
as long as the brushless motor is on the (wait for it, I'm about to type my favourite word) homologonogation list then its fine too, if its not on the list, you can't run it at BRCA events.
if you want a speedo right now, the Sphere comp is the one, if you can wait (not sure when we will see it in the UK) get the Sphere TC, even for buggy it will be ace, I believe thats what they were running at the Euros.
Bonded rotors is what is legal/normal in the current 'X9' LRP Vector motors, these are fast!
the 'X11' (not out yet) are faster still.
and from when I have felt comparing sintered mag Vs bonded, if they get in the car we are talking backflips at half speed! RC X-Games anyone?
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