Adapts an XD or XDR driver equipped wheel to run single speed7075 Aluminum carrier and cogs for durability with 6061AL spacersChainrings are designed with narrow wide alternating tooth pattern allowing for superior chain retentionAdjustable spacers to achieve the optimal chainlineKit includes carrier, lock ring, cog and a variety of spacers18TBlackXD/XDRUPC/EAN/GTIN: 810124711771