^^^ Winter tires are really squishy cause the are heavily siped, have lots of small, tall tread locks, and are made with a super sticky compound. So sticky they won't even assign snow tires a tread wear rating. A lot of poor boy racers use stud less snows for drag racing.
If you can't get blizaks, try the observes. Essentially the same tire but they claim to put acorn shells in them to act like mini studs. I find that funny, but they are great stud less snow tires and they have endless sizes.
Huh, guess I haven't noticed the grooves. Headed to Jalopy tomorrow. I'll pay closer attention.
Have fun at bogus. I'm real close to boycotting that resort all season....