# Connecting rod

> The connecting rod links the piston to the crankshaft and transfers the piston's linear motion into crank rotation.

- **Also known as:** Biyel, Kol, Conrod
- **Turkish term:** Biyel kolu
- **Category:** [Connecting Rods](https://motorsikletparcasi.com/en/category/connecting-rods)
- **Page:** https://motorsikletparcasi.com/en/glossary/connecting-rod

The rod's **small end** connects to the gudgeon pin and its **big end** to the crankpin. On small single-cylinder engines the big end usually runs on a needle roller bearing and the rod is replaced together with the [crank](https://motorsikletparcasi.com/en/glossary/crankshaft) as a pressed assembly.

- Big-end play makes a deep knocking noise from the bottom of the engine and, if ignored, the rod can break.
- Oil starvation and over-revving are the main causes of rod failure.

## Related terms

- [Crankshaft](https://motorsikletparcasi.com/en/glossary/crankshaft): The crankshaft converts the piston's up-and-down motion into rotation through the connecting rod.
- [Piston](https://motorsikletparcasi.com/en/glossary/piston): The piston moves up and down in the cylinder and transfers combustion pressure to the crankshaft through the connecting rod.

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- Source page: https://motorsikletparcasi.com/en/glossary/connecting-rod
- Last updated: 2026-10-09
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