They're 700x35 Ritchey Speedmax, totally adequate but a front studded tire would be a big improvement. The lower gearing (42/17) helped a lot, so it was hard to pick up enough speed that I had to skid, but it could skid & skip if I had to (definitely a lot less stopping power than what I'm used to, but enough) . In general, I was just slowing a bit extra into every intersection. Just switched back to slicks the other day cuz everything is FINALLY melting, the knobbies on the road were starting to really irk me.