The job
A bare twelve-spline lockring socket with one-inch wrench flats and a center-clearance bore.
Park Tool · Cassette-lockring tool
Park Tool FR-5.2 Cassette Lockring Socket
A bare twelve-spline lockring socket with one-inch wrench flats and a center-clearance bore.
$11.60Nov 7, 26, 12:51 AM · New York
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- Working pattern 12-spline cassette-lockring contact
- Quoted contact diameters Listing 23.5 mm; manufacturer approximately 23.4 mm — not a tolerance range
- Maker’s center clearance 12 mm
Working pattern
12-spline cassette-lockring contact
Use an existing appropriate drive
Choose the separate-socket format when that suits your driving arrangement. The handled FR-5.2H offers the same working pattern with a different operating format and bore.
What this choice changes
Keep the lockring fitting separate from your driving handle
The FR-5.2 suits a setup where you want the cassette-lockring contact as a separate socket and will provide the driving tool. It does not include the long operating handle of the FR-5.2H. Compare those formats around the tools you already own and the clearance you need, rather than treating them as different cassette standards.
The working fitting has twelve splines. The selected listing quotes 23.5 mm while the maker gives approximately 23.4 mm across the contact; that difference is not presented as a guaranteed fit tolerance. Park Tool specifies a 12 mm center-clearance bore and one-inch external flats. Match the exact component interface, not a nominal diameter alone.
The maker names supported cassette lockrings, certain internally splined disc lockrings and selected fork top caps. Those are specific applications, not universal coverage of every part in those families. During cassette removal the lockring driver and a suitable cassette counterhold remain separate roles.
Specifications & supplied details
| Detail | Specification |
|---|---|
| Working pattern | 12-spline cassette-lockring contact |
| Quoted contact diameters | Listing 23.5 mm; manufacturer approximately 23.4 mm — not a tolerance range |
| Maker’s center clearance | 12 mm |
| Driving interface | 1 in external flats |
| Body | Heat-treated alloy steel |
| Package | One socket; handle and counterhold not supplied |
Choose for your actual setup
Use an existing appropriate drive
Choose the separate-socket format when that suits your driving arrangement. The handled FR-5.2H offers the same working pattern with a different operating format and bore.
Identify the second tool
For cassette removal, compare a chain whip, spring-return cassette plier or locking counterhold independently. The socket does not restrain the cassette by itself.
Fit checks & limits
- An A+ image mentioning Campagnolo does not establish Campagnolo lockring fit.
- The two quoted nominal diameters do not establish interchangeability with a different twelve-spline freewheel remover.
Questions before you choose
Will it also remove my threaded freewheel?
Do not assume so. FR-1.3 is a different freewheel interface; matching spline count or a similar socket outline does not make the tools interchangeable.
Why choose the handled FR-5.2H instead?
It supplies an operating handle and the maker specifies a 20 mm bore rather than this socket’s 12 mm bore. Both still require the correct component fit and the appropriate counterhold for cassette removal.
Guides for this choice
Buying guide ↗
Match the Component Contact Before the Drive Handle
Separate the surface that touches the bicycle from the interface that accepts your wrench, then check access and any required retaining accessory.
Buying guide ↗Choose Chain-Service Tools and Drivetrain Counterholds
Build a tool list from the chain operation and sprocket fitting, separating wear checking, rivet driving, link operation and cassette restraint.
Alternatives to compare
Other equipment to consider
Selected listing details, manufacturer information and source images were compared. No hands-on trial or universal fit is claimed. Product identifier: B01LX3E08Z.