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is it for your blaster?
if so...i recommend maxxis razr 2's for the rear. i have them on my banshee and they're amazing. they grip so well in all types of terrain i've ridden on.
when i bought my banshee, it had blackwaters on the rears with maybe a 1/2 inch tread left. i could dump the clutch on any surface and they would just spin. when i put the razr 2's on i tested them out by doing the same. the front end pick right up and scared the crap outta me. they bite right in. even in soft sand they amaze me.
i don't have them on the fronts, yet. this spring i will though. from what i've read on a few atv forums, the razr and razr 2's are very good front tires.
http://www.maxxis.com
check out http://rockymountainatv.com. they seem to have good prices on atv stuff. or try a google search them.
also...check around these forums for other options.
http://forums.atvsource.com/
http://forums.atvconnection.com/
http://www.bluetraxx.com/phpBB/index.php