Apex XPLR D1HLC. Web. Services. CmsService. Models. Pages. CmsPageProductDetails Compatible with cassettes with 44T large cogs Use with Flattop chain Works with 12 speed mechanical Apex and Eagle shifters Clutch controls chain tension for consistent shifting X HORIZON straight parallelogram design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force SRAM Model ID: RD APX 1 D1 Attributes Maximum Cog 44T