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Demo wheels are a unique service of Bike Authority. These are wheels we make available for customers at no cost to take out and ride where they ride. Riding on familiar terrain is the best way to experience the great wheelsets we sell. You must be 21 years of age and all we require is a signed waiver and a depoist and it's yours to ride. We thought Zipp would stop tinkering with their 900 disc. We thought a disc wheel was a disc was a disc wheel, to paraphrase Gertrude Stein. We thought wrong. This latest version is 90g lighter than the previous generation Zipp disc. It still has only 19mm of frontal area, so it's still nearly invisible to the wind. It still has a dimpling pattern unique to the 900, which helps smooth the air flow to minimize drag. Its Aerodynamic Boundary Layer Control (ABLC) carbon fiber skins are embossed with over 4900 golf ball-like dimples in 5 different sizes patterned to force the airflow to form less turbulent boundary layers. You get less drag in all wind angles, as well as less buffeting of the disc in crosswinds. The result is the fastest disc tested -- and there are lots of discs out there. 
The Zipp 900 is available as a tubular or clicher. The wheel is two sheets of hand-laid carbon fiber with a honeycomb core. There are also configurations for wheelchairs and track front wheels. For the standard disc, there is a track adapter so the wheel can be used as a fixed-gear. The cassette body can come with Campagnolo splines or Shimano/SRAM splines for the appropriate cassettes. The hub bearings can be upgraded to ceramic. The disc comes with an angled valve adapter so that the tire can be pumped up and six Zipp "jersey" patches for covering the valve cutout. The Zipp disc weighs 950g (tubular) and 1222g (clincher) in the 700c version. Skewer is not included. |
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