Ultra light inner casing and the optimized steep bias angle result in rolling resistance that is 20% lower than the basic tubeless tires IRC offers Ultra light inner casing and the optimized steep bias angle result in rolling resistance that is 20% lower than the basic tubeless tires IRC offers Intended for mostly dry pure race conditions IAS - Features IRC`s IAS air retention system which helps keep air where it is suppose to be - in the tire LIGHT - Ultra light inner casing and the optimized steep bias angle result in rolling resistance that is 20% lower than the basic tubeless tires IRC offers