Translation guide
A device in a vehicle that shows how fast it is moving.
The instrument panel gauge showing current speed in a car, motorcycle, etc.
A small digital device mounted on a bicycle to measure speed and distance.
Standard term for a bicycle computer that shows speed, distance, etc.
For cars and motorcycles, 速度計 (そくどけい) is the most natural and common term. スピードメーター is also widely understood, especially in casual conversation. For bicycles, use サイクルコンピューター.
Please drive while watching the speedometer.
Common loanword from English, widely understood, especially in casual contexts.
The speedometer is showing 100 km/h.
The speedometer needle went off the scale.
I check my speed on the cyclocomputer.
Descriptive phrase meaning 'speedometer for bicycles', less common but clear.
I installed a bicycle speedometer.