One of the rarest motorcycles in the Throttlestop Collection, the Ariel Square Four! | CycleDrag

A 1939 Ariel Square Four is kick started into life. This is the second generation of the Square Four that had a complete a 995cc overhead-valve configuration. 1939 was also the first year that Ariel introduced their patented Anstey-link plunger rear suspension. Video and content is original and copyright to The Girder Club. | The Girder Club

Ariel square four 1000 #vintagemotorcycles #motorcycles #classicmotorbike #thatmotorcycleguy | L.A.Nik

A video that will surely be appreciated by the Ariel Motorcycle aficionados amongst you! Here we are with a look at some of the various iterations of the iconic Square Four. The Square Four is a motorcycle produced by Ariel between 1931 and 1959, designed by Edward Turner, who devised the Square Four engine in 1928. At this time he was looking for work, showing drawings of his engine design to motorcycle manufacturers. The early engine with "two transverse crankshafts" was essentially a pair of