Park Tool FR-4 Atom Splined Freewheel Remover
Tools
Park Tool FR-4 Atom Splined Freewheel Remover
Park Tool FR-4 Atom Splined Freewheel Remover
The Park Tool FR-4 is designed specifically for Atom-brand splined freewheels, a tool you need when working on older bikes equipped with this particular freewheel standard. Read the overview
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Overview
What Makes the FR-4 the Right Freewheel Remover?
The Park Tool FR-4 is designed specifically for Atom-brand splined freewheels, a tool you need when working on older bikes equipped with this particular freewheel standard. Its precision-machined body engages the splines cleanly, allowing you to apply real torque without stripping the remover or the freewheel itself. Built from hardened steel, the FR-4 gives you a secure grip on the freewheel body so removal goes smoothly even when the freewheel is stubborn from years of riding.
Park Tool's commitment to job-specific tooling means you're not forcing a universal solution onto a precision fit. The FR-4 slots directly into your bench vise or works with a wrench for leverage, giving you the mechanical advantage needed to break free a stuck freewheel without drama.
All the specs
SKU 210000000775
- Compatible Freewheel
- Atom splined
- Material
- Hardened steel
- Drive Interface
- 3/8 in square drive or bench vise
Good questions
Get to know Park Tool
There's more to Park Tool than this one product. Our Park Tool page has the full Park Tool lineup we carry and more about the brand.
Visit the Park Tool page →Will the FR-4 work on Sun Tour freewheels?
No. The FR-4 is designed specifically for Atom splined freewheels. For Sun Tour freewheels, use the Park Tool FR-2.
Do I need a bench vise to use the FR-4?
Not necessarily. The FR-4 works best in a bench vise, but it can also be driven with a wrench for field removal.
Is the FR-4 compatible with modern cassette drivetrains?
No. The FR-4 is a freewheel-specific tool and is not compatible with cassette-style drivetrain systems.
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