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The ATOM 66 freewheel presents a 14-26 tooth range across five sprockets, threaded 34.7x100 for French-standard hubs. The block is machined from steel and shows no oxidation, so the engagement faces and sprocket teeth retain their original definition. Photos form part of the description and document the unit's actual condition.
The 14-tooth top sprocket keeps the gear from spinning out on flat sections, while the 26-tooth low sprocket gives you a seated gear for loaded climbs and long false flats. This spread sits nicely on a touring bike built around classic 5-speed indexing or friction shifting. The 34.7x100 thread is the French standard — check your hub's shell before fitting.
If you are building around a French-thread hub and want a slightly wider range, the ATOM 77 5-Speed Freewheel 14-28 carries an extra climbing ratio on the same 34.7x100 thread. For a different maker on an identical pitch, the CYCLO 72 5-Speed Freewheel is another period-correct option worth comparing sprocket for sprocket.
It uses the French-standard 34.7x100 thread. Confirm that your hub shell carries the same pitch before fitting.
The sprockets run from 14 to 26 teeth across five speeds. This gives a practical spread for a period touring bike drivetrain.
No, the freewheel shows no oxidation. The steel sprockets and engagement faces are documented in the product photos, which form part of the description.
The ATOM 66 unit is constructed from steel.
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