cr2 gearbox brace and gearing

[londonladliam]

Hey guys.

Having Built a cr2 finally was just looking at various pictures of them and was curious how essential is a gear box brace?is this dependant on which batterty strap/bar you use?if you use to seperate battery straps running the length of the car this act as a brace/stiffener?

Gearing

What's most common sproket size guys were/are using with the cr2's,going to be runnng between a 10 and 8.5 motor. I'm south east based so either maratime or eden park would probably be the nearest track.or a good sprocket size that suits a manner of tracks.

Many thanks