ul>The Shimano FC-RX820-2 GRX 12 speed double chainrings are the perfect replacement for worn or damaged chainrings Shimano's class leading chainrings offer the optimum balance of light weight and rigidity for precise shifts even under high loads Featuring the optimum 48-31T chainring combination for those long off road gravel adventures for the smoothest pedalling even in the toughest and muddiest of conditions Designed to work with Shimano?s 12-speed HG+ chain providing more efficiency and improved power transfer Genuine Shimano replacement chainrings for the FC-RX820 2X cranksets available in 48T outer, and 31T inner manufactured from lightweight aluminium and with anodised teeth for increased durability Shimano part numbers: 48T-ND - Y0SC98010 matches 31T-ND - Y0SC9801T Compatible chain Shimano HG+ 12-speed