G-sport Roloway Cassette material: 7075-T6 aluminum hub shell | 4130 chromoly axle | chromoly driver | 4130 chromoly female axle bolts style: RHD (right-hand drive) / LHD (left-hand drive) compatible axle size: 17mm female axle | 14mm x1,25mm axle bolts driver: 9 teeth | 1-piece | 3 pawls & 3 springs spoke holes: 36H bearings: 16003 sealed cartridge ball hub shell bearings and precision caged needle driver bearing color: black additional information: Drive Side Effective Flange Diameter: 50mm Non-Drive Side Effective Flange Diameter: 50mm Drive Side Flange to Center Distance: 29mm Non-Drive Side Flange to Center Distance: 29mm