Shimano CUES RD-U4010 Rear Derailleur - 9/10-Speed Shadow Design Direct Attach Short Cage BLKShimano CUES RD U4010 Rear Derailleur 9 10 Speed Shadow Design Direct Attach Short Cage Black. The Shimano CUES RD U4010 rear derailleur has a compact cage design that is optimized to provide plenty of ground and tire clearance while maintaining smooth shifting performance for small wheel bikes. Compatible with Shimano 9 Speed (11 36t) and 10 speed (11 39t) LINKGLIDE cassettes only Shimano Shadow RD technology allows more aggressive riding with its