I have a Polaris 1000 HL four wheeler, i changed my original brake pads at 15 hours, and believe me they were done. i bought a 4 disc set from D2 moto for about what 1 disc set of originals would have cost and i just changed them at 31hrs, and they still had a little grit left. More then the original so called severe duty pads. I will keep buying D2 Moto Volar pads because why should i pay 30 to 40 dollars a set when they last the same amount of time. And yes they stop the bike just as well.