Alas, the world was changing, and with it the motorcycle market. The Ariel Square 4 designed decades before, was keyed to another age, one where acceleration and all-out top speed weren’t as important ...

Pioneered by Ariel and used by a few other brands, it was wonderfully balanced and sounded great. How come it's not in use today? Did you know that a square four engine used to be a thing? In fact, ...

The original Square Four was conceived by legendary motorcycle designer, Edward Turner, who later created the game-changing Triumph parallel twin. His original design for the Square Four was an OHC ...

VINTAGE - 1905 - 1944 Due to the rarity of these and other years and models of Ariel, pricing data is still being collected. These are approximate pricing guidelines. Make sure you're protected!

VINTAGE - 1905 - 1944 Due to the rarity of these and other years and models of Ariel, pricing data is still being collected. These are approximate pricing guidelines. Make sure you're protected!