Same tire mold, different casing. Fewer studs but in the section of the tire where it counts most. Haven't used these but they would definitely be a huge improvement over no studs if you ride in icy conditions. Basically a budget stud tire, which is a good thing, especially if you just plan to use them for commuting. Here in NYC, about 90% of the winter the roads will be plowed and you'll be dealing with slushy muck where regular tires perform fine. It's just iced over surfaces at night and stuff where the studs really shine. I keep an extra front wheel with a studded tire on it that I pull out when the conditions require it. Having both front and rear studded is better but one up front will keep you from busting your ass.