Hope Pro 5 Front Hub 6-Bolt - Black The Pro 5 is the latest hub design from cycling component artisans Hope. 24, 28, 32, 36 spoke hole options 6-Bolt rotor fitting 100 x 12mm, 100 x 15mm, 100 x 20mm, 100 x QR, Boost 110 x 12mm, Boost 110 x 15mm, Boost 110 x 20mm and Boost 110 x 15mm RS Torque Cap axle spacing options.