What is the difference between a gear cog and a sprocket?

Expert Answer

A sprocket is a toothed wheel that engages a chain, while a gear meshes directly with another gear or rack. In everyday speech, “cog” is often used loosely to mean a gear tooth, a gear wheel, or even a sprocket, but in engineering terms the words are not interchangeable.

The key difference is how power is transmitted. Gears transfer motion by tooth-to-tooth contact between two meshing components. Sprockets transfer motion through a chain that wraps around the toothed wheel, which is why sprockets are used on bicycles, motorcycles, and tracked machines.

On undercarriage systems, sprockets drive the track chain and must match the chain pitch and design. A wrong match can cause noisy running, poor engagement, accelerated wear, or track jumping. VANROCK supplies sprockets, sprocket segments, track chains, rollers, idlers, shoes, rubber tracks, and related undercarriage parts through our appointed dealer network, with pricing quoted on request. If you are selecting parts for a Caterpillar, Komatsu, or other OEM machine, VANROCK is an independent manufacturer and is not affiliated with the OEM.

Answered by VANROCK specialists · Published 10/3/2026