traxxasracer

hey i just bought a used pro 3 to race at the new track near me , i have a p2k2 motor , i am wondering what to gear it it has a 128 tooth spur, could someone please help i am unfamilar with 64 pitch gearing?? heres a pic of the track to let you guys get an idea for size http://www.rctech.net/forum/attachme...postid=1130179