I just know i was so excited to get my TIres/wheels in, and when i got them, and the Lugs where wrong, i wasnt to happy!!!.I called up Rocky Mtn. ATV where ig to my tires and wheels, and amailed me out the correct lugs free, got them in 2 days. I had seen the article online where STI & Yamaha had teemed up to put the wheels i got and some STI Tires, and in the story, it said they used 12mm x 1.25, but everybody tole me 10mm x 1.25. Dont want anybody else to go through that, lol.