I have studded Marathon Winter tires 700 x 53c. I got the version with the most studs. I love them and they've been getting lots of use. You can crank them up to their MAX pressure or soften them a little when there is more than 2" of snow. on dry roads, even at MAX pressure they will feel sluggish compared to 700 x 28c high pressure slicks but your overall time won't suffer much and you can still go fast on them.