While beer-based cocktails, in general, are underrated, the Shandy and the Radler are two of the most well-known, so let’s compare and contrast. In fact, they’re a lot more alike than they are different.
The shandy is made by mixing beer (a blond lager) with lemonade, or even lemon-lime soda. The ratio should be about 50-50 and you can mix-and-match with your choice of beer and fruity additions.
A Radler—which means cyclist in German—is a similar citrus and beer concoction but can also include other fruit juices, like grapefruit.
If you’re in the mood for a shandy and you order a Radler, you’ll still be enjoying a beer-and-juice combination with a citrusy and refreshing taste.
Besides using only lemon as fruit in Shandy, Shandy is the British name for it whereas Radler is the German name for them. The word “shandy” comes from the old British name “shandygaff,” a drink that was first mentioned in the 1850s relating to beer mixed with ginger ale. It so predates the Radler, which Bavarian tavern owner Franz Xaver Kugler invented out of necessity in 1922 when his daily supply of beer was running low. In fact, Kugler managed to kill two birds with one stone. He ensured that his customers had something beery to drink and got rid of the lemonade nobody was buying. Kugler named it Radler, or “cyclist” in German, after his thirsty patrons.
You can also check the Shandy/Radler here.
Source: eater.com, chowhound.com