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I ran my 13' Sportsman XP 850 H.O. on a snow covered river last Sunday. Run 1 was with 30" Monster Mayhems. My speedo read just under 50mph and it was confirmed that I was going 48mph on GPS. Run 2 I switched over to stock tires. My speedo now read 70mph and GPS confirmed I was going 56mph. There was a lot of tire spin with the stock tires. This is a great test showing the effect of rotating mass has on your speed, especially in snow. To give you an idea of the effect snow has on speed with a smaller motor I tested my 550 in these conditions. I ran the same tire on the river and on the street. I hit 70kph on the snowy river and 110kph on the street. Very interesting tests and I learned a lot from it.
 

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