Many European freewheels of past decades, from Regina to Atom, use a 20-spline fitting that no modern cassette tool can grip. The Park Tool FR-4 was made for exactly this: it is the Park Tool FR-4 freewheel remover for 20-spline fittings, essential for anyone working on vintage road bikes, city bikes and classic hubs.
The body is heat-treated alloy tool steel and the fitting, with an outer diameter of about 21.6 mm, engages all 20 splines, spreading the torque evenly and avoiding rounding off profiles that are often already worn. The 1 inch hex base lets you work with an adjustable wrench, socket or bench vise, choosing the option with the most leverage depending on how stubborn the freewheel is.
Park Tool FR-4 freewheel remover compatibility
- Atom and Regina freewheels with 20-spline fitting.
- Splined Zeus freewheels.
- Some Schwinn-approved freewheels.
- Older SunTour freewheels with 20-spline fitting.
Why choose Park Tool FR-4
- Covers the main European 20-spline standards with one tool.
- Heat-treated alloy tool steel built to free very tight freewheels.
- Full-spline engagement to protect the freewheel fitting.
- 1 inch hex for wrench, socket or vise.
Before starting, secure the tool with the quick-release or axle nut so it cannot pop out of the fitting under load. For restoring and servicing freewheel drivetrains, the Park Tool FR-4 freewheel remover is a reliable reference in any workshop.
TECHNICAL SPECIFICATIONS
General
- Item code: FR-4
- Type: 20-spline freewheel remover
- Drive: 1 inch hex
Materials
- Heat-treated alloy tool steel
Dimensions
- Splines: 20
- Fitting outer diameter: approx. 21.6 mm
Compatibility
- Atom, Regina, splined Zeus
- Some Schwinn-approved freewheels
- Older SunTour 20-spline freewheels
Many European freewheels of past decades, from Regina to Atom, use a 20-spline fitting that no modern cassette tool can grip. The Park Tool FR-4 was made for exactly this: it is the Park Tool FR-4 freewheel remover for 20-spline fittings, essential for anyone working on vintage road bikes, city bikes and classic hubs.
The body is heat-treated alloy tool steel and the fitting, with an outer diameter of about 21.6 mm, engages all 20 splines, spreading the torque evenly and avoiding rounding off profiles that are often already worn. The 1 inch hex base lets you work with an adjustable wrench, socket or bench vise, choosing the option with the most leverage depending on how stubborn the freewheel is.
Park Tool FR-4 freewheel remover compatibility
- Atom and Regina freewheels with 20-spline fitting.
- Splined Zeus freewheels.
- Some Schwinn-approved freewheels.
- Older SunTour freewheels with 20-spline fitting.
Why choose Park Tool FR-4
- Covers the main European 20-spline standards with one tool.
- Heat-treated alloy tool steel built to free very tight freewheels.
- Full-spline engagement to protect the freewheel fitting.
- 1 inch hex for wrench, socket or vise.
Before starting, secure the tool with the quick-release or axle nut so it cannot pop out of the fitting under load. For restoring and servicing freewheel drivetrains, the Park Tool FR-4 freewheel remover is a reliable reference in any workshop.
TECHNICAL SPECIFICATIONS
General
- Item code: FR-4
- Type: 20-spline freewheel remover
- Drive: 1 inch hex
Materials
- Heat-treated alloy tool steel
Dimensions
- Splines: 20
- Fitting outer diameter: approx. 21.6 mm
Compatibility
- Atom, Regina, splined Zeus
- Some Schwinn-approved freewheels
- Older SunTour 20-spline freewheels
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