City Bike Cassettes and Chains

Three Configurations

A city bike can be equipped in three ways. The screw-on freewheel, found on entry-level bikes, holds the sprockets in a block that screws onto the hub. The cassette, more modern, slides onto a splined freehub body. The hub with integrated gears, like the Shimano Nexus, has only one external sprocket: the gears are hidden in the hub, protected from dirt.

The Transmission

The city bike transmission also come in:

• Derailleurs.
• Chainrings.
• Cranks.
• Cables and Housings.

All the transmission information is gathered on the transmission page.

The Right Model

The chain must match the number of gears: a six, seven or eight speed chain is wider than an eleven-speed chain. Integrated gear hubs use a single-speed bike chain, which is more robust. E-bikes put more strain on the transmission: reinforced chains are chosen, designed for the motor’s torque.

Facing the Rain

An urban bike often lives outside: rain, humidity, and salt attack the chain. The chain guard, partial or full, protects the transmission and your trousers. The chain is cleaned regularly, lubricated with wet condition oil, and the excess wiped off. Its elongation is checked with a wear indicator, and it is replaced before it damages the sprockets.

Good Deals

Good deals can also be found in good plans, promotions, clearance, sales, and Black Friday. The new arrivals showcase the latest collections, and items shipped in 24h are prepared and sent within 24 hours. The highlights of the year follow a stable order: Black Friday at the end of autumn, the end-of-year holidays, winter sales, the French Days in spring, then the summer sales and back-to-school.

Frequently Asked Questions

How can I tell if my bike has a freewheel or a cassette?

You pedal backwards while observing the splined ring at the centre of the sprockets: if it turns with them, it’s a cassette; if it stays still, it’s a screw-on freewheel. This distinction determines the tool and the spare part needed.

Which chain should I choose for an integrated gear hub?

Integrated gear hubs, like the Shimano Nexus, have only one external sprocket: you choose a single-speed chain, which is wider and more robust. Its line not changing means it wears less quickly than with a derailleur.

How can I protect my chain from rust?

After a ride in the rain, wipe the chain and apply a wet condition lubricant, which is more tenacious. A chain guard protects it from splashes and keeps your trousers clean.

What are the advantages of an integrated gear hub?

The gears, hidden in the hub, are protected from rain and mud. You can change gears at a standstill, at traffic lights, and maintenance is reduced: a plus for daily commutes.

How many gears are needed for a city bike?

On flat city streets, three to seven gears are sufficient. On a hilly route, eight gears or more help maintain a smooth pedalling motion uphill, especially with a bike loaded with panniers.