Durable, reliable, authentic entry-level wheels. All black alloy rims and hubs with stainless steel spokes, 20-front, 24-rear spokes. Radial lace front, cross-lace rear. SHIMANO quality proven angular contact bearings, Rim wear indicator allows safe detection of worn rim. This Shimano wheel is 8,9,10-speed compatible. Rounded spokes (WH-R501 Aero bladed spokes) Weight: 1900g (WH-R501/WH-R501-A) 2001g.