Fulcrum's 2-Way Fit technology is the marquee feature of their high-end clincher wheels, and the Racing 3 is Fulcrum's least costly 2-Way Fit-specific model. 2-Way Fit is Fulcrum's way to describe tubeless road technology. Tubeless provides greater comfort, superior traction and a lower rolling resistance in comparison to traditional clincher tires. These benefits are akin to what you get from tubular tires, but the tire mounting process is almost identical to clinchers. No glue, no mess, and no finger blisters!
We recommend Hutchinson Road Tubeless tires when you're planning on going tubeless. The good news, by the way, is that if you puncture the tire mid-ride you can unthread the 2-Way Fit valve and install a standard innertube. Or, alternatively, you can run your Racing 3's like standard non-tubeless clinchers with whatever tire/tube combo you'd like.
If you look on the inside of the semi-aero profiled 2-Way rim you'll see that it has no spoke holes. This eliminates the need for rim strips and paves the way for tubeless tire installation. In order to get the spoke nipples in position to fix the bladed stainless steel spokes, Fulcrum uses a magnet to draw them into their respective seats using the valve stem hole as an insertion point. The burnished stainless steel spokes are anchored to an aluminum hub shell that spins on Fulcrum's smooth-running stainless bearings around an aluminum axle. The Racing 3 uses an anti-rotation attachment system to keep the oval aero spokes slicing cleanly through the wind as intended.
Both rims have been machined between the spoke holes to reduce any extra weight and feature Fulcrum's Dynamic Balance System. On the Racing 3's, this means that it lacks the machining near the valve stem hole. The tiny mass of remaining aluminum, acts to balance the weight of the opposing rim joint. The front wheel has 16 radially laced spokes, and the rear has 21 spokes using Fulcrum's Two-to-One pattern -- the non-drive side has 7 radial spokes and the drive side uses 14 tangentially laced spokes anchored to the oversized right side flange on the rear hub. The Two-to-One pattern ensures a greater transfer of your power input and a better balance of tension in the wheel for greater trueness and durability.
The Fulcrum Racing 3 2-Way Fit wheels comes with a new quick release design that provides greater clamping force and more security. It is available with either Campy or Shimano/SRAM compatible freehub bodies.