5-Speed ATOM Freewheel, Vintage Bike, 480g, 16-28, 34.7×100, Eroica RC47

The ATOM freewheel offers a 5-speed cluster with a 16-tooth small cog and a 28-tooth large cog. That spread covers rolling terrain, long valley roads, and the occasional wall without demanding a full drivetrain rethink. The body is steel, and the unit tips the scale at 480 grams. Threading is 34.7×100, a French bottom-bracket and freewheel dimension that appeared on numerous period machines.

Installation and Compatibility Factors

The 34.7×100 measurement defines the hub interface. Confirming your hub’s threading before purchase avoids mismatched components. The five-speed format suits older rear spacing and friction-shifting setups. The steel construction provides a solid, period-consistent feel under chain load.

For a period-correct rolling assembly, a compatible hub such as the MAVIC 500 RD vintage hub pair can be evaluated. If the complete bike still needs a front-end stance, the touring handlebar in 41.5 cm works with many builds from the same era.

Key specifications

• Country of origin: FRANCE
• Oxidation: No
• Material: Steel
• Freewheel - Cassette: 5V

The written description and the photographs together record the exact external condition of this used component, including any minor marks from storage or prior installation. A close look at the images provides the visual reference that completes the technical reading.