The Metron 81 SL is Vision’s Aero Triathlon and Time Trial focused wheel set. Vision’s complete wheel system has a 24mm rim width, direct pull bladed spokes, 6 sealed cartridge bearings in P.R.A. hubs, ABS brass nipples, 2 to 1 lacing, CFD / wind tunnel proven aerodynamics, and 100+ pro-podiums since its release. All Metron SL rim brake wheels also feature a laser-etched micro-dot brake surface texture that dramatically improves braking performance for safe, sure and predictable stopping power in all weather conditions. For a proven and reliable performance wheel set, look no further than the Vision Metron SL.