help with pinion

[footey]

hi all ive just fitted a 6.5 gtb in my losi xxx bk2 woundering what size pinion should i start with cheers:)

[XXXCRRacer]

Probably a 16 or 17 pinion should work.

[tyreman]

hi all ive just fitted a 6.5 gtb in my losi xxx bk2 woundering what size pinion should i start with cheers:)

Try 84/16-17

[philly]

You can find a gearing chart at this link.
I found it very useful. Hope it helps.
http://www.blaiswebcreations.com/rc/html/ratioxxcr.html