expression
to ride a bike, to cycle
A1
Rad fahren: colloquial expression meaning to ride a bike or cycle. The verbal element follows fahren conjugation (du fährst Rad). It’s used like a verb phrase for movement; perfect uses sein (Ich bin Rad gefahren). Not reflexive; commonly used in everyday German.
Examples
Der Junge fuhr Rad im Park, obwohl es schon dunkel wurde.
The boy rode a bike in the park although it was already getting dark.
Am Wochenende fahre ich gern Rad.
I like to ride my bike at the weekend.
Wir können in den Park Rad fahren.
We can cycle to the park.
Details
Mnemonics
Picture a wheel (Rad) and someone 'fahren' — you're riding a bike
Rad (rhymes with 'rad' in English) — riding is 'rad'!
Notes
A separable verbal expression in use (du fährst Rad), but treated here as a fixed multiword expression meaning to ride a bicycle.