Fast rolling directional tread with siping and larger horizontal corner lugs for improved cornering traction Redesigned Racing Ralph with updated tread designed specifically for use as a front tire on modern day XC trails SGRND - Super Ground, Snake Skin material running from bead to bead and three full carcass layers, the sweet spot between puncture protection and light weight in the Super lineup. SPDGRP - SpeedGrip - Addix SpeedGrip compound is Schwalbe`s all around performace upgrade compound well versed on all terrain and conditions SSKN - SnakeSkin - A light and flexible carcass makes the tire highly resistant to scrubbing