This is a dedicated lockring tool for installing and removing Shimano STEPS e-bike chainring lockrings. It’s built for proper torque application on Shimano mid-drive systems and replaces Shimano’s TL-FC39 service tool. Key Functional Details Designed for Shimano STEPS chainring lockrings Compatible with E6100, E7000, E8000, E9000, and EP8 drive units CNC-machined aluminum construction Red anodized finish for easy visibility in the shop Interfaces with 1/2" drive torque wrenches Compatible with Unior 1725/CF crowfoot for proper torque application Direct replacement for Shimano TL-FC39 Compatibility & Technical Notes Fits Shimano STEPS chainring lockrings only Compatible with Shimano STEPS E6100, E7000, E8000, E9000, and EP8 motors Designed for use with 1/2" drive torque wrench NOT compatible with standard Hollowtech II crank systems NOT compatible with non-STEPS e-bike motors Tool only — does not include crowfoot or torque wrench Service / Ownership Context This is a purpose-built e-bike service tool meant for correct chainring installation and removal. Proper torque is critical on STEPS systems to prevent creaks, loosening, and premature spline wear. Fit & Use Signals Good Fit: Shops and home mechanics servicing Shimano STEPS e-bikes. Not A Fit: Standard bicycles, non-Shimano e-bike motors, or riders looking for a general crank tool. This is a real e-bike service tool, not optional fluff. STEPS chainrings must be torqued correctly. If they aren’t, you get creaks, loose rings, and eventually chewed splines on expensive motors. Biggest customer mistake: trying to remove these lockrings with punches, hammers, or generic spanners. That destroys lockrings fast. Second mistake: reinstalling without a torque wrench. Hand-tight isn’t enough on STEPS. Aluminum body is fine because it’s meant to be used with proper torque — not impact tools. Who this is really for: shops or serious home mechanics servicing Shimano mid-drive e-bikes. Who should avoid: anyone without a torque wrench or anyone not working on STEPS systems. Typical service scenario: chainring replacement, deep drivetrain cleaning, or motor service. Mechanic advice: always clean threads, apply light grease, torque to Shimano spec, and re-check after first ride. These motors don’t tolerate sloppy installs.
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