Easton EC90 Aero Carbon Wheel Set Stiff and aerodynamic carbon wheelset, designed for versatile high performance time trial, triathlon, sprinting, climbing and cyclocross use. Please note: 8/9 Speed Shimano cassettes will not fit these wheels Features: Wheel size: 700C Weight: 700C - Front: 580 g, Rear 790 g, Pair: 1370 g Hubs: R4TT F - Black anodized finish. Unique aero design. Precision-sealed cartridge bearings with asymmetrical, low-drag seals. R4 series R - Black anodized finish. Precision-sealed cartridge bearings with asymmetrical, low-drag seals. Tool-free bearing preload adjustment front and rear. Cassette Body: All alloy, oversized inboard ratchet mechanism with three pawls. Precision-sealed cartridge bearings with asymmetrical, low-drag seals. Shimano, Campagnolo, and SRAM 8/9/10 speed compatible. Rims: Gen4 Easton carbon aero tubular. 56 mm front & rear. View rim profile. Spokes: Sapim Bladed Custom, stainless steel, black Spoke Count: 16 front, 20 rear Nipples: Internal black anodized aluminum front & rear. The EC90 Aero is the upgrade for the popular Tempest II carbon wheel set. However, it now comes with new Easton-made 56mm carbon rims laced to Easton R4 hubs; the EC90 Aero is stiffer and faster than its predecessor. Deep section rims offer incredible rotational and lateral stiffness providing quick acceleration and a smoother ride. This is a great hand-built road-racing wheel, but is equally at home for triathlons or cyclocross.