Cat SX basics! - Help a TV presenter!

[exint2]

Hi Nick from RC Racing here!

As you may know I'm "Having a go" at 10th offroad next weekend at the "King of the Dirt" race

Schumacher have very kindly leant me a Phil Booth edition Cat SX

So I need a bit of basic help

Firstly what are the supplied gears? how many teeth on the Spur and the gears in the "reduction box" - for want of a better term!!

Also a good starting ratio for a 7.5 (Nosram)

Oh and any other hints / tips would be great!

Thanks

Nick