
der Radfahrer
cyclist
A person who rides a bicycle.
Auf dem neuen Radweg sind viele Radfahrer unterwegs.
Many cyclists are out on the new bike path.
cyclist
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cyclist
A person who rides a bicycle.
Auf dem neuen Radweg sind viele Radfahrer unterwegs.
Many cyclists are out on the new bike path.

toadying bully
In a figurative, derogatory sense, a person who behaves submissively toward superiors ('nach oben buckeln' — to bow upward) but treats their subordinates badly ('nach unten treten' — to kick downward).
Er ist als Chef ein typischer Radfahrer: Bei seinem eigenen Vorgesetzten ist er überfreundlich, aber seine Mitarbeiter behandelt er von oben herab.
As a boss, he is a typical toadying bully: he is overly friendly to his own superior, but treats his employees condescendingly.
The word is made up of 'das Rad' (here in the sense of bicycle) and 'der Fahrer' (driver/rider). So it literally describes a person who rides a bike.
Achtung, hier überqueren oft Radfahrer die Straße.
Careful, cyclists often cross the road here.
The figurative meaning is based on the body position when cycling: you hunch upward ('buckelt nach oben' — submissive toward superiors) and kick downward ('tritt nach unten' — condescending toward subordinates). This image helps you remember the meaning.
Sein Verhalten ist typisch für einen Radfahrer: zu den Chefs nett, zu uns unmöglich.
His behavior is typical of a toadying bully: nice to the bosses, impossible to us.
In the figurative meaning, 'Radfahrer' (toadying bully) is always a derogatory description of a character trait. It is a criticism or an insult, not a neutral statement.
Niemand im Team mag ihn, weil er so ein Radfahrer ist.
Nobody on the team likes him because he is such a toadying bully.
cyclist / shandy
Radfahrer and Radler can both refer to a person on a bicycle. Radfahrer is unambiguous, while Radler without suitable context can also be understood as the name of a beer-and-lemonade drink. Radfahrer is therefore clearer when misunderstandings are possible.

Der Radfahrer wartet mit seinem Fahrrad vor dem Café.
The cyclist is waiting with his bicycle in front of the café.
Der Radler wartet mit seinem Fahrrad vor dem Café.
The cyclist is waiting with his bicycle in front of the café.