Kf pinion question

[metalmulisha598]

Hi all, I know this has probably been asked before a while ago but I'm unable to find any info. Any help will be greatly appreciated.

I've purchased a Schumacher kf (not 2) and I'm going to start racing at stout fold as its local to me, I've raced a few different classes before but not 1/10th buggy, I've got everything sorted all bar the pinion.

I'm running a 7.5t motor with kit 83 pinion so if anyone could advise a pinion for stotfold I would be incredibly greatfull. Thanks. Mark