Originally Posted by
Bah Humbug
Yes, and they have designations that help if you know what they mean but not when you just see them. For example, SK is "small knob" (cough). There's also SS "super speed", I think, but not quite slick. There are also slicks. And EXT. And I think others.
SK is the "standard", such as it is, and likely what @
datlas would use.
Ah - okay. Looking at them, the SS - long blocks on the shoulders, file tread down the middle - is actually what I'd use unless I thought that it was going to get muddy, then it'd be the SK.