R90 RimRim tape, valve and sealant is needed to run a tubeless set-upThe Manufacturer Spec ERD specification listed uses the less common ERD+ method. ERD+ is the manufacturer listed diameter of the rim at the spoke nipple seat and does not account for the height of the spoke nipple shoulder when calculating spoke length. If unfamiliar with this system of measurement physically measure ERD yourself prior to committing to a spoke lengthItem SpecificationsBrake CompatibilityDisc OnlyColorBlackDefined ColorBlackHub Drilling28ISO Diameter622 / Road / 29"Manufacturer Spec ERD (mm)580Rim Center Offset (mm)0Rim MaterialAlloyRim Width (Internal)19.5Tire TypeClincherTire TypeTubeless ReadyValvePrestaWeight455Wheel Size700c Easton R90 Rims UPC: 821973279534