# Gearbox

> The gearbox transmits engine speed to the wheel through different ratios so the motorcycle can run efficiently at any speed.

- **Also known as:** Vites kutusu, Transmission, Vites
- **Turkish term:** Şanzıman
- **Category:** [Gearbox & Shifting](https://motorsikletparcasi.com/en/category/gearbox-and-shifting)
- **Page:** https://motorsikletparcasi.com/en/glossary/gearbox

Motorcycles use a **sequential gearbox**: gears are selected in order with the foot lever (usually 1-N-2-3-4-5-6). Inside are the main and counter shafts, gears, selector forks and a shift drum; on most motorcycles it is lubricated by engine oil.

Scooters use a [CVT](https://motorsikletparcasi.com/en/glossary/cvt) instead of gears. The overall ratio to the wheel is the gear ratio multiplied by the [final drive ratio](https://motorsikletparcasi.com/en/glossary/final-drive-ratio).

## Symptoms of a problem

- Jumping out of gear under load (worn dogs or selector forks)
- Hard or notchy shifts (clutch adjustment or shift mechanism)
- Whining from the gearbox (worn bearings)

## Related terms

- [Clutch](https://motorsikletparcasi.com/en/glossary/clutch): The clutch connects and disconnects drive between the engine and the gearbox under the rider's control.
- [Final drive ratio](https://motorsikletparcasi.com/en/glossary/final-drive-ratio): The final drive ratio is the rear sprocket tooth count divided by the front sprocket tooth count; it sets how engine power is geared to the wheel.
- [Chain and sprocket kit](https://motorsikletparcasi.com/en/glossary/chain-and-sprocket-kit): A chain and sprocket kit is the front sprocket, rear sprocket and chain that make up the final drive to the rear wheel.

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