B44 Motor Gearing

[Jamesd]

Hi

I have an B44. I run on a large astroturf track.

I run an Novak GTB Brushless Speedo, with a Novak 5.5R velociti motor.

An 84spur, what pinion should I use?

If I use a Novak 5.5balistic would the gearing be different from the above motor, if so, what would you recommend?

Thanks