Yeah, very spendy. But interestingly the studded 45NRTH Dillingers are actually lighter than the regular stock tires, which is saying something. They also make a model with stud pockets so can install as many studs as you like for your typical conditions. As of now they these are only available in the 4" width. I don't have them but so far the Bud and Lou set I'm running have been way better than I expected on ice. The width, low pressure and the float really helps you keep a steady line. As with all ice you have to be careful in the corners but from what I'm seeing on my commute I think they'll be quite alright most of the time. I have a studded tire cross check that I can ride on the really icy days.