Sturmey Archer Single Speed Freewheel - 20T
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Product Information
Full details
The Sturmey Archer Single Speed Freewheel 20T is an ideal choice for cyclists seeking a reliable, durable drivetrain component for single-speed bikes and flip-flop hub setups. Offering a smooth pedaling experience with its chrome-plated steel construction, it provides consistent power transfer for daily commuting or casual riding. While it excels in durability and ease of installation, users should ensure their existing drivetrain chainring width is compatible with the 3/32-inch design to avoid mechanical friction.
All features
| Model Part Number | SFN20 |
|---|---|
| Brand | Sturmey Archer |
Extended Product Information
FAQs
Can I use this with a 1/8 inch chain?
This freewheel is designed for 3/32 inch chains. While a 1/8 inch chain may physically fit over the teeth, it will be loose and may cause excessive noise or chain derailment.
Does this require a special tool to install?
No, it can be tightened by hand onto the hub. The act of pedaling the bike will naturally tighten it to the correct torque.
Is this compatible with my flip-flop hub?
Yes, this model is specifically designed for use on flip-flop hubs, which typically feature standard ISO threads on both sides.
What does the 20T stand for?
The 20T stands for 20 teeth, which dictates the gear ratio of your drivetrain.
How often should I lubricate the freewheel?
A light application of oil every few months or after riding in heavy rain is recommended to maintain smooth operation.
Troubleshooting
Freewheel makes grinding noise when coasting
The internal pawls may be dry or dirty. Apply a few drops of light-weight bicycle oil into the gap between the rotating sprocket and the fixed body, then spin it to work the oil in.
Freewheel is stuck and difficult to remove
If the freewheel was not greased during installation, it may be seized. Use a long-handled freewheel removal tool and a bench vise if necessary to provide sufficient leverage.
Slipping sensation while pedaling
Check if the chain is fully seated on the teeth. If the slipping persists, the internal pawls may be worn out and the freewheel should be replaced.
Pros and Cons
Pros
- Durable chrome-plated steel construction
- Easy to install without specialized tools
- High compatibility with standard ISO threaded hubs
- Quiet and smooth engagement
Cons
- Limited to 3/32-inch chain systems
- Fixed tooth count of 20T may not suit all terrain needs
- Not suitable for high-torque mountain bike applications
Setup, Compatibility & Care
Installation of the Sturmey Archer Freewheel is straightforward. Because it features a standard ISO 1.375 x 24tpi thread, it screws directly onto your hub. It is designed to be self-tightening; as you pedal, the force of the chain locks the freewheel onto the hub threads. To remove it in the future, a standard freewheel removal tool should be used. Ensure the hub threads are clean and lightly greased with a bicycle-specific lubricant before installation to prevent seizing. To maintain performance, wipe away road grime periodically and apply a drop of light chain oil to the interface between the sprocket and the freewheel body to keep the pawls moving freely.