19mm Rim Drives the Design Spider's low profile 19 mm rim balances mass, strength, and stiffness. The rim is extruded and tempered aircraft quality aluminum alloy. The machined side wall enhances braking. The shallow aero sculpted parabolic rim shape fit within an integrated aerodynamic flow design that offers excellent side-on aero drag. Butted Stainless Steel Spokes Spokes are double butted stainless steel tapering from 2.0 to 1.7 mm.
Nipples are forged alloy.
The front hub weighs only 68g, the rear 240g. Both designs use sealed cartridge bearings. Fit Spoke count options allow tensioned wheel designs to accommodate different riders and race applications. Adding spokes trades off an increase strength, stiffness and durability for decreases in acceleration, and aero efficiency. To optimize rider fit, Spider comes in 4 standard spoke configurations for each wheel size.