The most advanced alloy existing for rims meets the most advanced rim profile to form the RR 411 rim. From the moment the alloy is melted all the way to the secret surface treatment, this rim is all about getting the absolute best out of the great, shiny metal that is aluminum. Very light, very strong and very classy. Features: Tubeless-Ready Alloy rim can be used with or without tubes (tape, valves and sealant sold separately) 2.0 silver alloy Prolock Squorx Pro Head nipples and PHR washers included The wheel must be built with the supplied PHR washers and Pro Head nipples. The PHR washer must be positioned between the nipple and rim and fit correctly within the radius of the rim. DT Swiss recommends that the contact area between the nipple and PHR washer is greased ERD and weights shown include PHR washers Specifications: Wheel Size: 700c ISO Diameter (ETRTO): 622 Effective Rim Diameter (ERD): 601mm Spoke Count: 20H or 28H Brake Type: Rim Brake Rim Joint: Welded Rim Dimensions: 18mm (Internal), 21.5mm (External), 21mm (Depth) Valve: Presta Tire Type: Tubeless (Clincher) Material: Aluminum Color: Black Weight: 475g