Blaster race tires

depends on what style racing ?????
18's seem popular for smoother mx tracks,
prolly 20's for gncc or rougher harescrambles
 
im rocking these for this years drag season if thats the racing u are doing, 22" AMS zippers..

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I have a 2003 Blaster and would like to know what size tires to run for racing .....

18" rear soft compound ITP Holeshots with 19-20" fronts for MX depending on your chassis geometry and suspension setup.

XC varies. Generally 20" rears and 21" fronts.....Razr-2s, Kenda Klaws, etc....your choice. In thicker mud or heaver terrain you may do 21" rear, 22" front or 22" all the way around.