STARCROSS® HP4 TIRES ARE DESIGNED FOR HARDPACKED, EXTREME BLUE-GROOVE CONDITIONS. STARCROSS® HP4 TIRES FEATURE INNOVATIVE KNOB PATTERNS DESIGNED TO HELP MAXIMIZE CORNERING TRACTION ON HARDPACK. THE WIDE 90/100-21 FRONT STARCROSS® HP4 TIRE (AS OPPOSED TO THE TYPICAL 80/100-21 SIZE) PROVIDES A LARGER CONTACT PATCH THAT ENHANCES PREDICTABILITY IN BLUE GROOVE CONDITIONS. THE TALLER, WIDER FRONT CASING ALSO PROVIDES GREATER AIR VOLUME FOR ABSORBING HARD LANDINGS. CLOSELY-SPACED KNOBS HELP MAXIMIZE CONTACT PATCH. TALLER, WIDER FRONT CASING ABSORBS HARD LANDINGS. INNOVATIVE KNOB PATTERN FOR CORNERING GRIP ON HARDPACK. SUITABLE FOR 250 FOUR-STROKES, 250 TWO-STROKES AND 450 FOUR-STROKES