John, the 4 stroke classes will be using MG Oranges. I believe those will be hard enough to get a full season out of them, or at the least I would guess 2/3 of a season. Part of that change was the no tire treatment rule that came into effect. Since that started, I heard multiple people saying they’d prefer a slightly softer tire because without treatment the YDS tires are horrible to drive on. We’ll have to see how the first season goes and we can switch to MG Blues, the harder compound, if the membership wants to.
As an anectote, the guy that won the class championship in 2014, 2015, and took second this year in Yamaha Sr. ran his race tires down to the cords before he got a new set. Especially at the club level, new tires will only help so much over driving.