We’re talking about 100cc laydowns and the 36″ wide sprinters (Animal and 2-cycle sprint – 100cc). The OP was asking about Yamaha Sportsman. R60 compound works great on those – 10-12 lbs. On some weekends I’ve run some of Friday practice, race Sat, race Sun and still have center lines on some of the tires. I’ve given some of my take-offs to budget racers who’ve used them for another weekend. Don’t know about your shifters. Have you discussed your application with Adam Batton at Hoosier? abatton@hoosiertire.com 574-784-3152