Winter tires

i use the stock ballon tires in the snow they seem to work good...i wanna try paddles but i wouldnt use new ones in case i break a paddle off
 
No a 21x12-8 should fit nicely under the blaster for snow you want the extra width, it helps with flotation and will grab more snow with each bite.
Snow mobiles rely on maximum snow bite, light surface loading (high flotation) the tracks grip enough snow at once to launch the sled on take off, without digging too deep. Atv's can often make it across some pretty deep patches of snow, with a little speed and the right amount of wheel spin.
With a light atv like the blaster you want a nice wide tire for the snow, you can always add front skis, rear tire chains, or removable cleats or studding for times when there is a lot of hard pack and ice.