Shimano Ultegra R8170 are a lightweight clincher full carbon deep rim for improved aerodynamics, increased rigidity and excellent inertia for sprinters and TT specialists.
 
Hubs:
Front Axle: 12mm
Rear Axel: 142x12mm
Freehub: Shimano 10-11-12 Speed
Bearings: Sealed 
Rotor Mount: Centrelock
 
Spokes: 
Spokes: Bladed 
Count: 24 Front / 24 Rear
 
Rims:
Brake Surface: Disc
Rim: Full Carbon, Clincher, TL-Ready
Depth: 36mm/50mm/60mm
Internal Width: 21mm
External Width: 28mm