If youre gonna ride on the street, i think 165 would be your best bet, though you could get away with 170. On a track frame the bb is higher up than on a road frame. If you are riding it on the track, go for 170 for sure, your legs will be happy. I am 5 foot 11 and I ride 165 on a track frame on the street and its nice and I feel I will never have to worry about pedal strike. I do take corners rather conservatively though. Comfortwise though I think i would be happier on a 170 just for the ability to have more length to deliver power, 165 feels very... compact?

anyone is welcome to correct me if they think im full of ****, I do not pretend to be an expert, i just am full of opinions