Campagnolo wheels ship with freehub bodies for Campagnolo cassettes, but if you're running Shimano drivetrains, you need the HG-compatible version to accept Shimano spline patterns. The FH-BO015X1 is the aluminum freehub body that fits Campagnolo and Fulcrum wheels using oversized 17-millimeter axles with angular contact bearings. It accepts Shimano 8-speed through 11-speed cassettes, though you'll need to add a 1.85-millimeter spacer behind the cassette if you're running 8, 9, or 10-speed.

The freehub body uses plasma electrolytic oxidation as a surface treatment, which creates a hard ceramic-like layer on the aluminum that resists corrosion and protects against the cassette cogs digging into the splines. This treatment is more durable than standard anodizing and holds up when you're torquing cassettes on and off repeatedly during maintenance. The body itself is machined aluminum with integrated splines that match the Shimano HG interface standard. Angular contact bearings sit at the inboard end where the freehub interfaces with the hub shell.

This freehub fits a wide range of Campagnolo road wheels including Bora, Shamal, Bullet Ultra, Hyperon, Eurus, Neutron, and Zonda models, plus Scirocco, Vento, and Khamsin wheels from their respective introduction years. On the Fulcrum side, it works with Racing Zero, Racing Speed, Racing Light, Racing 1 and 3, Racing Quattro, Racing 5 and 7, and Red Wind XLR. The critical spec is that your hub uses the 17-millimeter oversized axle with angular contact bearings—this freehub won't fit older Campagnolo hubs with standard axles or different bearing configurations.