Hey, how many teeth are you guy's running on your rear sprocket? I'm particularly interested in those of your riding tight tracks. I just read an article on Tim Ferry's bike. He is running a 55t! Also, I'm new to the track riding. What is the prime gear to be in?? I know this is subjective, but It seems that second is too low and third is too high. I thought that maybe a larger rear sprocket would help out. What do you think?? Thanks for any info.