Tubeless wts ready for any adventure the ust compliant 19mm internal rim can be used with 28mm and 30mm tyres to offer grip and control in all conditions strength to weight ratio of any ksyrium superlight ism 4d rims weigh just 430 grams each combined with double butted steel spokes makes for a light stiff wheel adapted to the constraints of disc brakes 24 spokes for perfect brake torque distribution combined with the option to run quick release adapters mean that these will offer high perf