标题: XG999 [打印本页] 作者: rick 时间: 2010-2-2 12:14 标题: XG999 Weighing in at 175 grams, the XG999 cassette employs Sram's X-Glide and X-done technologies in its design.
Seven of the nine cogs are CNC-machined together out of a single block of billet steel, creating an incredibly lightweight, precise and strong cassette
