Fulcrum Red Metal Wheels are for cross country and range from the top Zero model through the 1,3 and 5, mainly different by their weight.
The Zero is a cutting edge wheel from Fulcrum as used by Julien Absalon the 2007 cross country World Champion. Featuring: 2:1 spoke ratio on rear wheel for extra stability under load, 2:1 spoke ratio on disc rotor side of front wheel for extra stability under braking, Incredible lightweight 1456g per pair (V-brake model), Lightweight alloy oversized axle, High precision bearings, UST compatible rim, Sealed bearing freehub body, Includes quick releases, Available as 6 bolt international standard, AFS (Centrelock) and V-brake.
The Red Metal 1 and 3 are UST compatible.
Red Metal 1 weighs 1665g a pair.
Red Metal 3 weighs 1853g a pair.
Red Metal 5 weighs 1805g a pair and is the entry level wheel.