Make the night riding safer. Hole: Front 20 + 20 back. 1 pair wheel (one front and one set of rear wheels and 1 pair of Hanks and tapes). Includes axles QRM durability, seal, sleeve bearing. Can use for 8/9/10/11 speed free. Can fit 19C to 28C tires. Edge width 13.5mm, 40mm. Weight: 40mm front wheel 950G rear wheel 1000G.