>>1238592Yeah it's a matter of frame/fender/brake clearance. Schwalbe makes the Winter tires in 30c and Marathon Winters in 35c, Marathons have twice as many studs and I guess a different compound so I'd recommend those if your frame fits them.
Also if there isn't that much ice you can usually get by with just cyclocross tires, I did a couple of winters on a brakeless fixie in Finland with 35c Schwable Rocket Rons & didn't have much trouble.