Park Tool LRT-4 Lockring Tool for Shimano Direct Mount Front Chainrings Designed and built to remove and install Shimano direct mount chainring lockrings found on XTR 9120, XT 8120, MT900, and other Shimano direct mount systems, as well as other chainring lockrings with 16 notches and a 41mm outside diameter. The LRT-4 features 36mm hex fittings for use with the Park Tool TWB-36 Crow Foot (available separately). Precisely CNC machined from 6061 aluminum for a perfect fit and to prevent marring expensive parts. Park Tool LRT-4 Lockring Tool for Shimano Direct Mount Front Chainrings Designed and built to remove and install Shimano direct mount chainring lockrings found on XTR 9120, XT 8120, MT900, and other Shimano direct mount systems, as well as other chainring lockrings with 16 notches and a 41mm outside diameter. The LRT-4 features 36mm hex fittings for use with the Park Tool TWB-36 Crow Foot (available separately). Precisely CNC machined from 6061 aluminum for a perfect fit and to prevent marring expensive parts. As with every other component found on a bicycle, Park Tool offers a full line of tools for bicycle lockring chainrings, including many of the most popular modular crank and e-bike chainring standards: As with every other component found on a bicycle, Park Tool offers a full line of tools for bicycle lockring chainrings, including many of the most popular modular crank and e-bike chainring standards: LRT-1 Chainring Lockring Tool LRT-2 Chainring Lockring Tool LRT-3 Chainring Lockring Tool LRT-4 Chainring Lockring Tool BBT-18 Chainring Lockring & Bottom Bracket Tool BBT-49.2 Chainring Lockring & Bottom Bracket Tool Add to Cart Add to Cart Add to Cart Buying Options Add to Cart Buying Options Customer Reviews 4.5 out of 5 stars 48 4.6 out of 5 stars 116 4.6 out of 5 stars 169 — 4.6 out of 5 stars 467 4.6 out of 5 stars 82 Price $27.95$27.95 $29.95$29.95 $24.95$24.95 — no data $24.95$24.95 — no data Tool Fitting 8 Notches - 50mm Outside Diameter 16 Notches - 54mm Outside Diameter 4 Or 8 Notches - 47-48mm Outside Diameter 16 Notches - 41mm Outside Diameter 8 Notches - 43.4mm Outside Diameter 16 Notches - 39mm Outside Diameter Brand/System Compatibility Bosch Gen 2 E-Bikes Including Active Line (chainrings less than 20 teeth), Performance Line and Performance Line CX models Shimano STEPS E6100, E7000, E8000 and E9000 E-Bikes Some Specialized, Cannondale and FSA modular cranks XTR 9120, XT 8120, MT900, and other Shimano direct mount systems Bosch Gen 3 & Gen 4 E-Bikes Shimano STEPS E6000, E6002, & E6050 E-Bike Systems Equivalent Tool Bosch 0275009003 Shimano TL-FC39 Cannondale KT012, FSA E0667 Shimano TL-FC41 no data Shimano TL-FC38 TRUSTED SINCE 1963 Since our origins in the back of a bike shop in 1963, it has been Park Tool's sole mission to design and manufacture high-quality tools that empower mechanics and riders of all skill levels to service their bicycles. As with our other 500+ tools, our lockring tools are a product of our decades of experience and expertise in the industry, in the shop and on the trail.