For breaking in the YS115WS you can use what is shown in the user manual, anything from a 14x6 up to a 14x11. For actual racing everyone is using a 13.5x13.5 APC, or a 13x13N on 30% which give you around 10200 - 10500 RPM on the ground and it will then unload more in the air, perfect for gold class racing.
Last edited by hossinarizona; 12-09-2017 at 07:20 PM.