Shimano Cassette Lockring Specifications: The Complete Guide

Introduction: Why Are There So Many Types?

Think there’s only one type of cassette lockring? Think again. Shimano’s cassette systems range from 8-speed to 12-speed, from road bikes to mountain bikes, and from HG (Hyperglide) to MS (Micro Spline). There are actually several different lockring specifications.

Use the wrong tool and you can’t get it off; mix up the specs and the cassette won’t fit. This article lays out all Shimano cassette lockring specifications in one clear reference.

The Evolution of Shimano Cassette Systems

Freehub Body Types

Type	Full Name	Speeds	Notes
HG	Hyperglide	8-11 speed	Most widely used
MS	Micro Spline	12 speed	Shimano’s new standard

Why Did the New Standard Appear?

The smallest cog on a 12-speed cassette is smaller than on 11-speed, and the traditional HG freehub body diameter can’t accommodate such a small cog. So Shimano designed the smaller-diameter Micro Spline freehub body.

Complete Lockring Specification Guide

HG System Lockrings

Cassette Type	Speeds	Lockring Tool	Lockring Spec	Removal Torque
CS-HG31/41/51	8 speed	TL-LR15 or universal	Standard HG	30-50 Nm
CS-HG50/400	9 speed	TL-LR15 or universal	Standard HG	30-50 Nm
CS-HG500/700	10 speed	TL-LR15 or universal	Standard HG	30-50 Nm
CS-HG600/700/800	11 speed	TL-LR15 or universal	Standard HG	30-50 Nm
CS-R8000 (Ultegra)	11 speed	TL-LR15 or universal	Standard HG	30-50 Nm
CS-R9100 (Dura-Ace)	11 speed	TL-LR15 or universal	Standard HG	30-50 Nm

Micro Spline System Lockrings

Cassette Type	Speeds	Lockring Tool	Lockring Spec	Removal Torque
CS-M6100 (Deore)	12 speed	TL-LR11	MS lockring	40 Nm
CS-M7100 (SLX)	12 speed	TL-LR11	MS lockring	40 Nm
CS-M8100 (XT)	12 speed	TL-LR11	MS lockring	40 Nm
CS-M9100 (XTR)	12 speed	TL-LR11	MS lockring	40 Nm
CS-R8100 (Ultegra)	12 speed	TL-LR11	MS lockring	40 Nm
CS-R9200 (Dura-Ace)	12 speed	TL-LR11	MS lockring	40 Nm

Center Lock Disc Brake Lockrings

Note: Disc brake rotor lockrings are different from cassette lockrings!

Type	Tool	Notes
Internal spline lockring	TL-LR15	Uses cassette tool
External spline lockring	TL-LR11 or BB tool	Uses external spline tool

Tool Guide

Essential Tools

Tool	Purpose	Price	Alternative
TL-LR15 (or universal cassette tool)	HG lockring removal/installation	NT$200-500	Park Tool FR-5.2
TL-LR11	MS lockrings and external spline disc lockrings	NT$300-600	BBT-69.2 (Park Tool)
Chain whip	Holds cassette to prevent rotation	NT$300-600	Park Tool SR-12.2
Adjustable wrench or socket	To turn the lockring tool	NT$100-300	Common in most toolboxes

When to Use Each Tool

TL-LR15 (internal spline tool):
├── All HG cassette lockrings (8-11 speed)
├── Some Center Lock rotors (internal spline type)
└── The most commonly used tool

TL-LR11 (external spline tool):
├── All Micro Spline cassette lockrings (12 speed)
├── Center Lock rotors (external spline type)
└── Essential tool for the 12-speed era

Cassette Removal and Installation Guide

Removing the Cassette

1. Remove the rear wheel
2. Install the lockring tool: Insert the appropriate lockring tool into the lockring
3. Install the chain whip: Wrap it around the middle cogs of the cassette
4. Direction: Hold the chain whip in the drive direction (to prevent the cassette from rotating)
5. Turn: Rotate the lockring tool counterclockwise
6. Once the lockring is loose: Unscrew it by hand
7. Remove the cassette: Take off each cog and spacer in order

Important: Remember the order of each cog and spacer when removing the cassette! Taking a photo is the best method.

Installing the Cassette

1. Confirm the freehub body type: HG or MS
2. Clean the freehub body surface
3. Apply a thin layer of grease: On the splines of the freehub body
4. Install the cogs in the correct order:
   • Align the grooves on the cogs with the splines on the freehub body
   • The HG system has one narrower spline as a locating feature
   • The MS system also has an alignment design
5. Place the lockring on
6. Tighten by hand
7. Torque to the recommended spec with the lockring tool:
   • HG: 30-50 Nm
   • MS: 40 Nm

Important Notes

• No chain whip is needed for installation (tightening direction matches the pedaling direction)
• Do not overtighten the lockring (especially on aluminum freehub bodies)
• If the lockring won’t thread on, verify the cassette cog order is correct
• Cassettes of different speeds cannot be installed on the wrong freehub body

Compatibility Notes

HG Cassette Compatibility

Freehub Body	Compatible Cassettes
HG (Shimano)	Shimano 8-11 speed, SRAM 8-11 speed, KMC, etc.
HG (SRAM XD)	Incompatible, requires XD driver body
HG (Campagnolo)	Incompatible, different splines

MS Cassette Compatibility

Freehub Body	Compatible Cassettes
MS (Shimano)	Shimano 12-speed only
MS (other brands)	Some licensed brands

Common Mix-Ups

Situation	Result	Solution
12-speed cassette on HG freehub body	Won’t fit	Requires MS freehub body
11-speed cassette on MS freehub body	Won’t fit	Requires HG freehub body
Using TL-LR15 on MS lockring	Wrong tool	Use TL-LR11
Using TL-LR11 on HG lockring	Wrong tool	Use TL-LR15

Buying Advice for Taiwanese Riders

1. Bike shops usually have lockring tools: If you’re unsure about the spec, bring your wheel in
2. Third-party tools work fine: Brands like Park Tool and Unior offer excellent quality
3. Buy all your tools at once: TL-LR15 + TL-LR11 + chain whip, and you’ll be able to remove anything in the future
4. Lockrings are reusable: But replace them if they show any damage
5. The 12-speed era is here: If you plan to upgrade to 12-speed, buying the MS tool sooner saves you hassle later

Conclusion

Shimano’s cassette lockring specifications may seem complicated, but you only need to remember two key points: HG uses the TL-LR15, and MS uses the TL-LR11. Master this principle, add a chain whip and the correct torque values, and you’ll be able to handle all cassette removal and installation work yourself.

Replacing your own cassette not only saves you the shop’s labor costs, but also gives you a deeper understanding of your drivetrain. Next time the chain and cassette need replacing together, you can do it yourself.

Related Reading

• Shimano Freehub Body Specifications: HG, Micro Spline, and XD Compatibility
• The Complete Cassette and Chainring Compatibility Guide: Understanding Drivetrain Pairing Logic
• The Complete Cassette Gear Ratio Guide: 11-28 vs 11-30 vs 11-34
• 12-Speed Chain Technology Explained: Shimano vs SRAM vs KMC vs Campagnolo