Originally Posted by
willwebb
My bike is a 2011 Jamis Bosanova with 28mm Vittoria Randonneur Cross tires. I am not sure how wide of a tire my bike can handle, but I believe it will go up to 35mm with fenders.
This bike review says your frame can do 38mm with fenders. 32-35 is the sweet spot for commuters IME. If you like your existing tires you could just get the wider versions - if you want knobs or studs for snow you might need a little more room under your fenders.
Review: Jamis Bossanova | Bicycle Times Magazine