The Nankang AR-1 is designed with track use oriented concept in Mind! The AR-1 tire with 100 treadwear rating is available in 12" to 21". It is a faster, more reined track tire, aimed at the track enthusiast who is hunting lap times. Expect the same grip from lap 1 till the cords are showing as these do not Fade or turn "Greasy" like the R888R.