Zipp Axlcap SET REAR COGN DB QR S1Zipp Axlcap SET REAR COGN DB QR S1 The Zipp Axlcap SET REAR COGN DB QR S1 brings the performance and reliability Zipp is known for, engineered for riders who want dependable gear that stands up to real world use. SERVICE Axle cap set rear COGNITION CL Disc QR SRAM. Built to Zipp's exacting standards, it's a practical upgrade whether you're heading out for a training ride, a weekend adventure, or the next race. The Zipp Axlcap SET REAR COGN DB QR S1 is