Castle Creations motor and ESC combo recommendations for the Team Associate RB10.

Sidewinder w/1406-4600kv - 23 pinion / 87 spur  on 2s = ~36MPH
Copperhead 10 w/1412-3200kv - 23 pinion / 78 spur on 3s = ~42MPH
Mamba X w/1415-2400kv - 31 pinion / 69 spur on 3s = ~47MPH

Note: All speed estimates are with stock tire diameter, high quality batteries and appropriately sized battery connectors.
Always monitor ESC, motor and battery temperatures on new setups or when changing gearing or batteries.