Dual compoundracing compound rc255a combination of two different compounds 65a for low rolling resistance and long life on the inside and 55a on the outside for perfect grip on all downhill courses tyre casing frc120 freeride casing with 120tpi for less weight and faster rolling tubeless ready tlr special bead technology for quick and tight air sealing of tire and rim tubeless ready tlr works best with onza39s tyres seal up sealant