Developed to complement the efficient aerodynamics of the Factor OSTRO VAM, the Black Inc 48|58 wheelset rim design revolves around a shallower 48mm rim section for the front and deeper 58mm rim section for the rear wheel to boost stability in blustery riding conditions. The 23mm internal rim width combined with the mini-bead hook rim has been optimized for 28mm tubeless and clincher tires. The rims are laced to the high-flange hubs with lightweight and durable carbon fiber spokes to ensure that the Black Inc 48|58 is an incredibly strong and immensely lightweight set of wheels. Specs Spokes 20 Black Inc Straightpull Aero Carbon Spokes Spoke Pattern 2x/2x Nipples Black Inc Oversize Internal Alloy Type Weights Shimano: 1300g (Front: 545g, Rear: 755g) *Weight excludes tubeless tape and certain metal parts. Compatibility Shimano HG 10/11 speed cassette, SRAM 10/11 speed cassette, SRAM 12 speed cassette Hub Front: HU-08 High Flange Alloy Body WT / Rear: HU-08 High Flange Alloy Body WT Hub Width Front: 100mm / Rear: 142mm Axle Type 12mm Thru Axle Bearings Black Inc + CeramicSpeed WT Brake Interface Center Lock ASTM Classification Level 1 Material High Modulus Carbon Fiber (T-700/ T-800/ T-1100) Finish UD glossy clearcoat Type Interface Tubeless and Clincher (inner tube) Type Compatibility Tubeless / Tubeless Ready / Clincher Recommended Tyre Size 700c x 28mm Rim Height Front: 48mm / Rear: 58mm Rim Width Internal: 23mm / External: 29mm Rim Decals Water Transfer Decals with High Polish Glossy Clear Coat Finish Assembly The 48|58 wheels are hand built by artisanal wheel builders and inspected with the latest electronic machines. This process guarantees that every single wheel's quality, performance and reliability.