Park Tool LRT-1 - Bosch Gen 2 Lockring Tool
Not Available
Currently unavailable
Currently out of stock
This product is not available at the moment. Check back later.
Product Information
Full details
The Park Tool LRT-1 is a professional-grade workshop tool designed for e-bike mechanics and enthusiasts who service Bosch Gen 2 motor systems. Its primary benefit is providing a precision fit for removing and installing chainring lockrings on Active Line, Performance Line, and Performance Line CX motors, ensuring secure maintenance without damaging the hardware. However, it is a specialized tool restricted to specific Bosch motor configurations and is not compatible with Gen 3, Gen 4, or other e-bike motor brands.
All features
| Model Part Number | 321080 |
|---|---|
| Brand | Park Tool |
Extended Product Information
FAQs
Does this work on Bosch Gen 4 motors?
No, the LRT-1 is specifically engineered for Bosch Gen 2 motor systems and will not fit the lockring pattern or diameter of Gen 4 motors.
Can I use an impact driver with this tool?
It is not recommended. Using an impact driver can damage the lockring notches and the motor internals; use a hand-operated torque wrench instead.
What does the 3/8 inch square drive mean?
It means the tool is designed to accept a standard 3/8-inch drive ratchet or torque wrench, allowing you to use your existing shop tools to operate it.
Do I need to remove the crank to use this?
Yes, you must remove the crank arm before the LRT-1 can be placed onto the lockring.
Is this tool compatible with Active Line motors using 20+ tooth chainrings?
No, this tool is specified for Active Line motors only when the chainring has fewer than 20 teeth.
Troubleshooting
Tool slips out of lockring notches
Ensure the crank arm is fully removed and the tool is seated squarely against the lockring before applying pressure.
Lockring is too tight to remove
Apply a penetrating oil to the lockring threads and allow it to sit before attempting to loosen again with a longer 3/8" drive handle for more leverage.
Pros and Cons
Pros
- High-quality, heat-treated steel construction ensures long-term durability
- Precision machining prevents slipping and damage to the lockring notches
- Compatible with standard 3/8-inch drive torque wrenches for precision work
- Replaces OEM Bosch tool 0275009003 for easier professional service
Cons
- Not compatible with newer Bosch Gen 3 or Gen 4 motor systems
- Requires crank arm removal prior to use
- Limited utility outside of specific Bosch Gen 2 drive systems
Setup, Compatibility & Care
Before using the LRT-1, ensure your e-bike is securely mounted in a bike repair stand for stability. Compatibility is strictly limited to Bosch Gen 2 systems, specifically: Bosch Active Line (if chainring size is < 20T), Performance Line, and Performance Line CX. Always confirm the lockring features the 50mm outside diameter and 8-notch design before beginning. For tool care, clean the notches of the tool after every use to ensure no grit is present during the next installation. Store the tool in a dry place to prevent surface oxidation, although the plating offers significant protection against rust. Avoid using an impact wrench with this tool, as it can cause localized damage to the aluminum lockring interface.