Park Tool Shimano direct-mount lockring wrench LRT-4 - 41mm 16-notch, 6061 aluminium slim profile

Park Tool LRT-4 is a purpose-built aluminium lockring wrench engineered to install and remove Shimano direct-mount chainring lockrings with a 41mm outside diameter and 16 notches.

The LRT-4 gives mechanics and home tuners a slim, accurate tool tailored for modern Shimano direct-mount chainrings such as XTR 9120 and XT 8100. Machined from 6061 aluminium, it balances light weight with strength and features the exact 16-notch engagement needed to prevent slippage and damage when you torque lockrings. Whether you're servicing a bike at the trailhead or in a workshop, this tool simplifies alignment and keeps the job clean.

Which Shimano chainrings does the LRT-4 support?

The LRT-4 is sized specifically for Shimano direct-mount chainrings that use a 41mm outside lockring with 16 notches. It covers common modern drivetrain families where Shimano adopted the direct-mount standard, ensuring compatibility across multiple models.

• Fits Shimano XTR 9120 and XT 8100 direct-mount chainrings
• Compatible with other Shimano models using 41mm/16-notch lockrings
• Not intended for non-Shimano or older threaded lockrings

How does the LRT-4 protect lockrings and chainrings during service?

The tool's notch pattern and precise OD prevent rounding or slipping that can mar lockring teeth. Machined tolerances let the tool sit flush against the lockring, distributing force evenly so you can apply torque safely without damaging the chainring or nearby components.

• Exact 16-notch engagement reduces cam-out risk
• Flat seating minimizes lateral movement while turning
• Aluminium construction avoids excessive marring of alloy lockrings

What handle or drive options work with the LRT-4?

The LRT-4 is designed to accept standard driver methods so you can use the handle or breaker style appropriate for the task. Its profile works with compatible wrenches and extensions that fit the tool's center opening, giving flexibility for workshop or on-bike use where space may be tight.

• Use with common hex or pin-type drivers compatible with the center bore
• Suits low-profile applications when working with crankset assemblies
• Fits a range of torque methods from hand-tight to workshop torque tools

Why choose an aluminium lockring tool over steel alternatives?

Aluminium tools are lighter and gentler on alloy lockrings while still offering sufficient strength for routine installation and removal. The LRT-4's 6061 construction reduces weight carried in a trail kit and lessens the chance of damaging softer lockring materials compared with harder steel jaws.

• 6061 aluminium balances strength and lightness for portability
• Lower hardness reduces the risk of scoring delicate lockrings
• Corrosion-resistant finish for lasting surface integrity

Who is this for? The Park Tool LRT-4 is made for bike mechanics, avid cyclists, and weekend wrenchers who regularly service modern Shimano direct-mount drivetrains. If you own or maintain bikes equipped with XTR 9120, XT 8100, or any Shimano chainring that specifies a 41mm, 16-notch lockring, this tool speeds safe removal and installation while protecting your components. It’s also useful as a lightweight spare for mobile repair kits or bike-packing setups where saving grams matters but precision cannot be sacrificed.