What pinion?

[Olliedog]

Hi Guys
I'm new touring cars, but just about to order a Schumacher Mi1 with a Speed Passion Cirtix Sensor ESC Combo 13.5T Ultra Sportsman V2.0 from Modelsport, will be running around at the Moto Arena and Bedworth, can you give me an idea of what pinions I should be buying with the kit.

Use to race buggies a few years ago and starting to get back into it.

thanks

Andy