Ariel Square Four MKII


  • The Ariel Square Four was a British built motorcycle between 1931 and 1959
  • The MKII Ariel had a redesigned frame to provide clearance for the high mounted SU carburetor
  • This marvel of ingenuity produced 40 hp and was capable of 100 mph top speed
  • This example has been painstakingly ground up restored by the experts at Retrospeed in Belgium, WI
  • 997cc 4-stroke engine with a very unique design using two transverse crankshafts
  • This “Plunger” style rear suspension was used from 1939 until the end of its production in 1959
  • This 1959 Ariel Square Four is believed to be one of the last imported to the United States