der Fahrradfahrer
cyclist
A person who rides a bicycle.
Der Fahrradfahrer trug einen Helm und eine leuchtende Jacke.
The cyclist was wearing a helmet and a bright jacket.

cyclist
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cyclist
A person who rides a bicycle.
Der Fahrradfahrer trug einen Helm und eine leuchtende Jacke.
The cyclist was wearing a helmet and a bright jacket.

The word is made up of 'Fahrrad' (bicycle) and 'Fahrer' (driver/rider). A 'Fahrer' is a person who operates a vehicle — in this case, a bicycle.
Ein Fahrradfahrer muss die Verkehrsregeln genauso wie ein Autofahrer beachten.
A cyclist has to follow the traffic rules just like a car driver.
The word belongs to the word family of 'Fahrrad fahren' (to ride a bicycle). The activity is called 'das Fahrradfahren' (cycling; nominalized verb), and the person who does it is the 'Fahrradfahrer' (cyclist).
Am Wochenende sind bei gutem Wetter viele Fahrradfahrer unterwegs.
On weekends, when the weather is good, many cyclists are out and about.
'Fahrradfahrer' is often combined with adjectives that describe riding behavior. Common examples include 'schneller' (fast), 'langsamer' (slow), 'vorsichtiger' (careful), or 'rücksichtsloser' (reckless) Fahrradfahrer.
Rücksichtslose Fahrradfahrer gefährden Fußgänger auf dem Gehweg.
Reckless cyclists endanger pedestrians on the sidewalk.
cyclist
'Radfahrer' and 'Fahrradfahrer' both mean, in normal usage, a person who rides a bicycle. 'Radfahrer' is a bit shorter and very common, for example in traffic contexts or in the news. 'Fahrradfahrer' is a bit more precise because the word 'Fahrrad' (bicycle) appears directly in it. For the person on the bicycle, you can usually use both words without a difference in meaning. The figurative, derogatory meaning of 'Radfahrer' is not meant here.

Im Park müssen Fahrradfahrer langsam fahren.
Cyclists must ride slowly in the park.
Der Radfahrer hält an der roten Ampel.
The cyclist stops at the red traffic light.