How thin wires are suitable fot the 17.5 (SP V3) motor, 16 maybe 18 AWG? I think there are max 16 Amps for the motor and 3 Amps for the BEC... 16AWG should be enough and 18AWG is too thin?
this is what a lot of people around me use
http://www.tqracing.com/16%20gauge.htm
not sure if its available over in Europe or not