TL-FC41 ADAPTER INSTALLATION TOOL FOR IMPACT WRENCH

Shimano's 12-speed mountain cranksets use a direct mount chainring interface that requires a dedicated lockring tool for installation and removal. The TL-FC41 provides that interface with a precision-machined spline profile that engages the lockring securely. The tool works as an adapter—it fits over the Hollowtech II spindle and onto the lockring, then accepts a standard bottom bracket wrench on the outer hex to provide the leverage for tightening or loosening. If you're swapping chainring sizes, replacing a worn ring, or building up a new crankset, this tool makes the job possible.

The TL-FC41 features a 16-notch spline pattern on the inside and a 32mm hex on the outside. That outer hex interfaces with Shimano's TL-FC36 or TL-FC32 bottom bracket tools, or any 32mm wrench you have in the shop. The spline profile matches the lockring precisely, which matters because sloppy tool fit leads to rounded notches and damaged lockrings. Shimano machines this tool from hardened steel, so it holds up through repeated use without the splines wearing down or deforming under torque.

Compatibility covers the full range of Shimano 12-speed mountain cranksets using the direct mount chainring system. That includes XTR FC-M9100, M9120, and M9130, XT FC-M8100, M8120, and M8130, SLX FC-M7100, M7120, and M7130, and Deore FC-M6100 and M6120. The same lockring design carries across the entire tier range, so one tool handles chainring service on any of these cranksets regardless of groupset level