The job
A twenty-spline freewheel remover with one-inch driving flats; exact component fit needs confirmation.
Park Tool · Threaded-freewheel remover
Park Tool FR-4 Legacy 20-Spline Freewheel Remover
A twenty-spline freewheel remover with one-inch driving flats; exact component fit needs confirmation.
$8.95Nov 7, 26, 12:51 AM · New York
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- Receiving interface Legacy 20-spline freewheel fitting
- Maker’s approximate outside contact 21.6 mm
- Drive 1 in external base
Receiving interface
Legacy 20-spline freewheel fitting
Use the geometry and exact component
The distinct twenty-spline contact is the useful selection fact. Confirm the actual freewheel rather than treating an associated brand list as universal.
What this choice changes
A different legacy spline pattern to identify before buying
The FR-4 is for a legacy twenty-spline receiving pattern. That makes it mechanically different from the twelve-spline FR-1.3 and the tab-ended FR-2/FR-3 tools. Count and identify the actual contact pattern before relying on the freewheel’s brand or on a similar-looking cylindrical socket.
Park Tool lists an approximate 21.6 mm outside contact and heat-treated alloy tool steel, with a one-inch base for an appropriate separate driving tool. The selected listing and the maker’s feature list name Atom, Regina and splined Zeus examples. The maker’s overview uses a different family attribution, so those brand names are not used here as an automatic compatibility filter.
Choose this only after confirming the actual twenty-spline application. A central axle-clearance figure was not established in the exact documentation read, so do not borrow the clearance of another FR-series remover.
Specifications & supplied details
| Detail | Specification |
|---|---|
| Receiving interface | Legacy 20-spline freewheel fitting |
| Maker’s approximate outside contact | 21.6 mm |
| Drive | 1 in external base |
| Body | Heat-treated alloy tool steel |
| Axle-clearance bore | Not established in the exact documentation read |
| Package | One remover; suitable drive separate |
Choose for your actual setup
Use the geometry and exact component
The distinct twenty-spline contact is the useful selection fact. Confirm the actual freewheel rather than treating an associated brand list as universal.
Check access separately
A tool fitting into the spline pattern does not establish clearance around your axle. Verify that requirement for the actual component.
Fit checks & limits
- The manufacturer overview and feature list differ on the named freewheel family; no general SunTour compatibility is added.
- No reliable tool mass is taken from the listing’s 0.27 g field.
Questions before you choose
Is it the same tool as the twelve-spline FR-1.3?
No. The twenty-spline contact is a different receiving pattern, even though both tools use an external one-inch driving base.
Can I select it only because my freewheel is a named brand?
No. The source family descriptions are inconsistent. Confirm the actual twenty-spline fitting and its application before choosing.
Guides for this choice
Alternatives to compare
Selected listing details, manufacturer information and source images were compared. No hands-on trial or universal fit is claimed. Product identifier: B001B6LKXS.