Exerpt from Vuelta's Website-
Formula for Speed
High spoke count with aero rim and precision bearings equals velocity.
The ultimate track wheels. Purpose built for the velodrome or Keirin circuit.
Each wheelset is stress relieved by the hands of skilled craftsmen not less than three times. Trued and tensioned each time to strict specifications.
Rim: 1186P 30mm deep section(700c)MSW Bead: clincher Hub: Vuelta Track double fix rear - sealed bearing Bearing: 2x2 precision bearing Drilling: 32f/36r Pattern: radial (f) / 3 cross (r) Spoke Gauge: 1.8 bladed Spoke Profile: Black Aero-bladed Nipple: brass Quick Release: n/a bolt-on Spacing: 120mm rear / 100mm front Color: black Cogs: (2)15tx1/8" included w/lockrings Weight: 1065g (f) / 1280g (rear WITH cogs and lockrings) List: $249 USD