The 7 K-A is a double wall rim that features 34mm width, 17mm height and is made from 7000 series aluminum.ERD: 390mmItem SpecificationsColorHard BlackWeight453Hub Drilling36Rim Depth17Manufacturer Spec ERD390ValveStandard SchraderISO Diameter406 / 20 BMXWheel Size20Tire TypeClincherRim Center Offset0Rim JointWeldedBrake TrackNon-MachinedRim Width (External)34Rim MaterialAlloyEyeletsNoneQBP Measured ERD (mm)395