The Black Inc FORTY FIVE wheelset is the perfect partner to the OSTRO, balancing aerodynamics, lightness, strength and stiffness. Its performance is driven by a proprietary rim profile and our new ratchet driven hub. The FORTY FIVE is disc-only, tubeless-ready and optimised for 25-28mm tyres, with an internal rim width of 20.7mm. The new Black Inc hubs run on CeramicSpeed bearings and feature an aggressively machined, lightweight freehub.