chainwheel
/ˈtʃeɪnˌwil/
noun
- A wheel with teeth that engages with a chain, used to transmit power in machinery, especially on a bicycle.
- The factory uses a large chainwheel to drive the conveyor belt.
- The chainwheel on his bike was rusty and needed replacing.
- Mechanics often check the chainwheel for wear when servicing a motorcycle.