der Radler
cyclist
A person who rides a bicycle; a bicyclist.
Am Wochenende sind immer viele Radler am Flussufer unterwegs.
On weekends, there are always many cyclists out along the riverbank.

cyclist / shandy
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cyclist
A person who rides a bicycle; a bicyclist.
Am Wochenende sind immer viele Radler am Flussufer unterwegs.
On weekends, there are always many cyclists out along the riverbank.

The context makes it clear whether the person or the drink is meant. Verbs like 'fahren' (to ride) or 'stürzen' (to fall/crash) point to the person, while 'trinken' (to drink) or 'bestellen' (to order) refer to the drink.
Vorsicht, auf dem Weg sind viele Radler unterwegs!
Careful, there are lots of cyclists on the path!
The term for a cyclist is derived from 'das Rad' (short form for bicycle). The ending '-ler' is often used in German for people who perform a certain activity.
Als passionierter Radler fährt er jeden Tag zur Arbeit.
As a passionate cyclist, he rides to work every day.
The mixed drink is called 'Radler' mainly in southern Germany and Austria. In northern Germany, people often say 'Alster' or 'Alsterwasser' instead.
In Hamburg bestellt man im Restaurant eher ein Alster als ein Radler.
In Hamburg, people are more likely to order an Alster than a Radler in a restaurant.
A Radler is a very popular drink in German beer gardens, especially on warm summer days. It is considered refreshing and less strong than pure beer.
Nach der Wanderung haben wir uns im Biergarten ein Radler gegönnt.
After the hike, we treated ourselves to a shandy in the beer garden.
cyclist
'der Radfahrer' and 'der Radler' can both mean a person who rides a bicycle. 'Radfahrer' is neutral and fits almost all situations, including news, rules, or traffic contexts. 'Radler' sounds a bit more casual and colloquial, especially when talking about leisure time or a bike tour. Important: 'Radler' can also mean a drink. If the context is not clear, 'Radfahrer' is more unambiguous for the person.

Am Sonntag machen viele Radler eine Pause am See.
On Sundays, many cyclists take a break by the lake.
Der Radfahrer wartet an der roten Ampel.
The cyclist is waiting at the red traffic light.