The ultimate addition to any XC mountain bike set up, the Black Inc TWENTY SEVEN wheels offer a race ready lightweight performance and combine it with a long term durability that will ensure your rig can keep rolling from 24-hour marathon to 100 mile mountain bike races.The 29-inch Black Inc TWENTY SEVEN cross-country specific mountain bike wheels have been designed with the strength required to withstand everything modern technical race courses offer and riders demand. They have a best-in-class weight with a 27mm inner rim width that can easily accommodate a 2.4-inch tire.Specifications:- Spokes: 28 Pillar SR X-TRA 1424 Aero Butted straight pull- Spoke Pattern: 2x/2x- Nipples: Pillar External Brass DSN 16 mm type- Weights: Shimano: 1630g (Front: 723g, Rear: 957g)- Compatibility: Shimano HG 11/12 speed cassette, SRAM 13 speed cassette- Hub: Front: HU-06B Alloy Body, Rear: HU-06B Alloy Body- Hub Width: Front: 110mm / Rear: 148mm- Axle Type: Front: 15mm Thru Axle, Rear: 12mm Thru Axle- Bearings: Stainless Steel- Brake Interface: Center Lock- ASTM Classification: Level 3- Material: High Modulus Carbon Fiber (T-700/ T-800)- Finish: UD matte glossy clearcoat- Type Interface: Tubeless- Type Compatibility: Tubeless- Recommended Tyre Size: 29 x 2.25″- Rim Height: 27mm- Rim width: Internal: 27mm / External: 33mm- Decals: Water Transfer- Assembly: The TWENTY SEVEN disc brake wheels are hand built by artisanal wheel builders and inspected with the latest electronic machines. This process gurantees that every single wheel´s quality, performance and reliability.- Included Accessories: 1. Tubeless Valves / 2. Tubeless Tape / 3. Valve Extensions (Presta) / 4. Valve Core Removal Tool