Pronounced 39cross king39 the x king perfectly fills in the gap between our race king and mountain king ii in terms of application the tyre is designed for xc and trail use with speed as the main priority it was developed in conjunction with the topeak ergon professional mtb team who have now already recorded many race wins on what they call the perfect race day tyre the addition of a protection layer under the tread and in the sidewalls makes it particularly durable and resistant