The XR-200 is KinLin's lightest clincher road rim, and possibly one of the lightest aluminum rims out there. Featuring a boxed aero cross section, this rim may not be the most aerodynamic rim but it's ideal for use on a climbing or weight-conscious wheel set and is super strong. The XR-200 is extruded from a super light Niobium-Aluminum alloy and joined with a high quality pinned joint. It comes with a high gloss anodization and machined sidewalls. For riders over 55kg (120 lbs), we do recommend higher spoke counts (24 front, 28 rear minimum) and do not recommend them at all for riders over 85kg (190 lbs).