The Starcross® HP4 is the hardpack tire for extreme “blue-groove” conditions. Starcross® HP4 tires feature innovative knob patterns designed to maximize cornering traction on hardpack. The wide 90/100-21 front HP4 (as opposed to the typical 80/100-21 size) provides a larger contact patch that enhances predictability in blue groove conditions. The taller, wider casing also provides greater air volume for absorbing hard landings.
Closely-spaced knobs help maintain contact patch
Taller, wider front casing absorbs hard landings
Innovative knob pattern for cornering grip on hardpack
90/100-21 front size provides large contact patch for predictability in blue-groove conditions