The Shimano Dura-Ace WH-9000-C75 Tubular Wheelset are not for every day. They are a serious set of aero wheels, which will probably not be what youll need to kick ass on your Saturday morning group ride. But if you are committed to your triathlons or you have a particularly important event that requires trotting out the big guns in aero performance, then the C75 tubulars should be high on your list of essential gear. To work with this set up, Shimano has also developed their extra-wide flange hub. This baby is even wider than the wide flange hubs they are using for the 9000-C24 wheels. It increases the triangulation base between the two hub flanges and the rim, thus maximizing lateral rigidity, something that is particularly important when youre talking about the power youll be putting down using these in a time trial or at Ironman. Youll also get the benefit of Shimanos hubs that use the angular contact ball bearings and are designed to roll as smoothly as possible, largely by virtue of the way the bearings interact with the races. The oversized A7075 alloy axles are super stiff, increasing the overall rigidity of the wheels. The more rigid, the more responsive they are going to feel. The freehub body is made from lightweight titanium. Compatible with Shimano and SRAM 11-speed systems, Shimano has also included a thin spacer so the wheels can still run with 8/9/10-speed cassettes. The C75s have a three year manufacture warranty. The Shimano Dura-Ace WH-9000-C75 Tubular Wheelset come with a set of Shimano carbon specific pads, the R55c4 carbon. You are strongly recommended to use only Shimano's own carbon-specific brake pads for Shimano carbon wheels. Youll get much better braking results, and using any other pads will void the warranty.