The FR 541 may not be your first rim, but it aspires to be the last. The new rim shape improves the impact resistance, enabling you to push a little harder on the trails. It also enhances the pinch flat protection for a trusty ride on rougher tracks. Build this rim with care and it will reward you with resistance and lightness for a long-lasting bond. Aluminum welded construction, hooked tubeless design. PHR – Pro Head Reinforcement system increases the load-bearing surface of the nipples on the rim and reduces localized stresses. Provides a 17% increase in pinch flat resistance compared to the previous FR 560 rim. Disc brake only. Item Specifications: Brake Compatibility: Disc Only, Rim Width (Internal): 30, Brake Track: None, Manufacturer Spec ERD (mm): 565, Valve: Presta, Color: Black, Weight: 570, Wheel Size: 27.5", Defined Color: Black, ISO Diameter: 584 / 650b / 27.5", Hub Drilling: 28, Rim Material: Alloy, Tire Type: Tubeless Ready, Rim Center Offset (mm): 0,