This high-quality bearing is perfect for replacing the old one on your FSA/ Vision hub. Measuring 24x 9x 7mm (RD-61) in size, this is a great choice of upgrade or spare for breathing new life back into your wheel hub. Genuine Vision replacement part. Vision products were launched nearly 20 years ago at the Kona Iron Man. Since then they have earned the reputation of being amongst the fastest & most aerodynamic components in the professional field. Vision components are designed using Computational Fluid Dynamics (CFD) software & verified through extensive wind tunnel testing, then proven under its sponsored professional athletes to guarantee you the highest performance. Manufacturer's Part Number: 752-6575 Blue/ Silver One Size 24 x 9 x 7 mm