At 0 degrees on packed snow/ ice in northern Vermont I had mine up to about 90 mph on the speedo.
90-95mph
probably around 75-80mph
55
That size sled runs about 65 to 75 mph.
I have a stock 1999 Scrambler 400 4x4 that I GPS'd at 67mph and I'm 240lbs. They are quick for the price.
It all depends upon what year the scrambler is. 1990 Polaris scramblers will go 30 to 40 miles per hour. 1995 Polaris scramblers go around 67 miles per hour, so it all depends.
105
It can go 55 mph
It will go about 40mph.
240mph
52-55mph
not fast enough to ride in the dunes