I ran the Poo white hyfax last year a part of this year. I just recently changed them out as I was getting paraniod. I still had about 2-2.5mm left in the thinest area's. I'm planning on cutting them in sections and will post. If you use the Poo hyfax, your going to have to work to get them on. The width of the groove is about 2mm narrower that the Yamaha rails, this may not seem like much but trust me it's a workout. I got about 3200 miles on them and was happy with their performance so I figured I stick with them. I do however use the actual Polaris part not aftermarket, the poo ones seem thicker from the start, this may actuall work best and may be the reason for the larger dia wheels. The problem is that I also changed my track to a 128" X 1" fully punched Hacksaw, so it's not a stock to stock comparo.