The Metron 81 SL is Vision’s Aero Time Trial focused wheelset. 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 over the last few seasons. The Metron 81 SL are living proof that Vision wheels are amongst the best in the business. Look no further, you’re new Clincher or Tubular wheelset is waiting. Features • Full Carbon 81mm section clincher rims • upgraded P.R.A. hubs with DP spokes • 6 sealed cartridge bearings (2F + 4R) • 2:1 aero bladed spokes 16F / 21R • Angular contact bearings on rear hub • Black Aero bladed spokes • ABS self locking nipples • Artisan built, entirely by hand • Includes QR-93, brake pads and spoke protector • Aluminum Shimano/Sram/FSA 10-11sp freehub • 1820g / pair (w/o QR)