The 404 firestrike 2015 carbon clincher 700c rear wheel from zipp the leading engineers of speed for more than a quarter century the 404 firestrike is the most advanced clincher wheel ever with unlimited capabilities the 404 firestrike carbon clincher is designed for durability and impact resistance but is also light weight simply put zipp set the industry standard for strength and durability in a carbon clincher with its versatile 58mm rim depth the 404 firestrike carbon clincher it st