Ariel Square Four | Great Britain 🇬🇧, 1940. The Ariel Square Four is one of the most famous names among Britain’s original “big” bikes, standing side-by-side with the likes of Brough Superior and Vincent HRD. The Square Four is a motorcycle that was born of a surprisingly simple idea, a motorcycle not made for racing or raw performance, although it was capable of that, but a motorcycle made for comfortable long range cruising with or without a sidecar. One might wonder why an engineer would co