I Believe either a 53 or a 55 will for you. I have a Quantum. Kleins came in odd numbers. 51-53-55-57 I believe. The 55 fits me as well as my Jamis 54 did but it is more of a fit. By the way I love the bike. This is a picture the day I brought it home. It has a different saddle and pedals today but I haven't changed much more. Mine in a 91 with Dura Ace 7400 STI, Derraileurs, seat post, brakes, cranks and hubs.