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, ...