The job
A 16-notch direct-mount chainring tool driven through a separate 36 mm wrench or crowfoot.
Park Tool · Direct-mount lockring tool
Park Tool LRT-4 Direct-Mount Lockring Tool
A 16-notch direct-mount chainring tool driven through a separate 36 mm wrench or crowfoot.
$26.80Nov 7, 26, 12:53 AM · New York
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- Working component Matching Shimano direct-mount chainring lockring
- Contact 16 notches; 41 mm outside diameter
- Driving flats 36 mm
Working component
Matching Shimano direct-mount chainring lockring
Identify which lockring you are servicing
A chainring, cassette and bottom-bracket cup can each require different tooling. Start with the exact component and contact dimensions.
What this choice changes
A 41 mm contact for matching Shimano chainring lockrings
The LRT-4 is for a matching Shimano direct-mount chainring lockring, not for an external bottom-bracket cup. Its 16-notch contact measures 41 mm outside, which is a different fitting from the larger 16-notch BBT-9/BBT-19.2 family. Counting the notches alone is therefore not enough to choose between these tools.
The CNC-machined 6061 aluminum body has a flat engagement face and 36 mm external driving flats. You supply the driving wrench. Where the component procedure requires a torque-wrench connection, Park Tool identifies its TWB-36 crowfoot as a separate accessory; neither that crowfoot nor a torque wrench is included.
Park Tool names Shimano XTR 9120, XT 8120 and MT900 examples. Verify the exact crank and lockring model before ordering rather than assuming that every Shimano direct-mount system shares the contact. This tool’s job is chainring retention; it does not replace a slotted chainring-nut counterhold or a crank puller.
Specifications & supplied details
| Detail | Specification |
|---|---|
| Working component | Matching Shimano direct-mount chainring lockring |
| Contact | 16 notches; 41 mm outside diameter |
| Driving flats | 36 mm |
| Body | CNC-machined 6061 aluminum |
| Named examples | Shimano XTR 9120, XT 8120, MT900 |
| Supplied | One LRT-4; wrench, crowfoot and torque wrench separate |
Choose for your actual setup
Identify which lockring you are servicing
A chainring, cassette and bottom-bracket cup can each require different tooling. Start with the exact component and contact dimensions.
Plan the driving connection
Check the component’s tightening procedure and suitable wrench connection before buying the socket alone.
Fit checks & limits
- Not interchangeable with 44–45 mm 16-notch bottom-bracket tools.
- The selected listing uses XT 8100 shorthand while the maker names XT 8120; confirm the actual crank and lockring model.
Questions before you choose
Will a 16-notch bottom-bracket tool work instead?
Not on notch count alone. The LRT-4 contact is 41 mm outside, distinct from the larger BBT-9/BBT-19.2 fitting.
Does it include a torque-wrench adapter?
No. The tool’s external flats are 36 mm. The maker’s TWB-36 crowfoot and the torque wrench are sold separately.
Is this for ordinary chainring bolts?
It engages a direct-mount chainring lockring. A slotted chainring nut uses a different counterhold such as a correctly fitting CNW-2.
Guides for this choice
Selected listing details, manufacturer information and source images were compared. No hands-on trial or universal fit is claimed. Product identifier: B083WMQP91.