Offering both a lightweight and a wider profile, the XC821 has fast accelerations and grip in all situations. This sleeved rim offers simplicity and reliability with its hookless profile and tubeless compatibility. In addition, with an enhanced tyre profile, comfort and puncture protection.**UST Tubeless technology**Traction and control. The UST concept improves traction, control and comfort while reducing inertia and flats**SUP welding**Strong and smoother. After bending the rim joint is arc welded. The welded seam is then milled for a smooth finish**Specifications*** Material: S6000 Aluminium* Braking: Disc* Profile: Asymmetrical and hookless* Joint: Sleeved* Drilling: Traditional with eyelet* Height: 20mm* Internal width: 21mm* ETRTO: 584x21TSS* Tyre: UST Tubeless Ready* Valve hole diameter: 6.5mm* Tubeless tape width: 25mm (Not included)* Recommended tyre width: 25 to 64mm* Spoke bed diameter: 558mm* Weight: 424g