Velocity Aeroheat road, mountain and BMX rims, also a good rim for recumbents. RM4468 is a good fit for recument bicycles. 6000-series aluminum. Matches up with RM4466 20 x 1.5" and RM4469 16 x 1-3/8". Presta valve unless otherwise noted. MSW machined sidewalls. Item Specifications: Color, Black/Silver, Weight, 440, Hub Drilling, 32, Rim Depth, 22, Manufacturer Spec ERD, 537, Valve, Presta, ISO Diameter, 559 / 26" mtn, Wheel Size, 26", Tire Type, Clincher, Rim Center Offset, 0, Rim Joint, Sleeved, Brake Track, Machined, Defined Color, Black, Rim Width (External), 24, Rim Material, Alloy, Rim Width (Internal), 18.5, QBP Measured ERD (mm), 535,.