1959 Ariel 998cc Square Four MkII  Frame no. CGM 2039 Engine no. CNML 2080

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Lot 460A
1959 Ariel 998cc Square Four MkII
Registration no. 550 NG Frame no. CGM 2039 Engine no. CNML 2080

Sold for £ 2,990 (US$ 4,202) inc. premium
1959 Ariel 998cc Square Four MkII
Registration no. 550 NG
Frame no. CGM 2039
Engine no. CNML 2080
Designed by Edward Turner, creator of the legendary Triumph Speed Twin, the first Ariel Square Four was shown at the Olympia Motorcycle Show in 1930. Conceived as an overhead-camshaft 500, the model grew to 601cc before a total redesign saw it emerge as the Model 4G, with 995cc overhead-valve engine, in 1937. Anstey-link plunger rear suspension became an option in 1939, but would not be offered again until 1946, when a telescopic front fork replaced the previous girder type. An exercise in weight shedding saw the cast-iron cylinder head and barrel replaced by alloy components for 1949, the revised model, now capable of 90mph-plus, being known as the Mark I. Introduced in 1953, the ‘four pipe’ MkII with re-designed cylinder head elevated the Square Four into the league of genuine 100mph motorcycles. Square Four production, along with that of all other Ariel four-strokes, ceased in 1959. To date, the innovative Ariel Square Four remains unique in motorcycling history; a true ‘gentleman’s motorcycle, this refined yet characterful machine retains an enthusiastic and loyal following, and is highly prized by discerning enthusiasts.

This example dates from the last (1958/59) season of production and has the Anstey link rear suspension and full-width alloy front hub, both of which were standard features by that time. Delivered new in Norwich, the machine comes with old-style buff logbook and Swansea V5C detailing its full ownership history to the present day. We are advised that the registration mark is transferable.

Saleroom notices

  • 1959 Ariel 998cc Square Four MkII Registration no. 550 NG Frame no. CGM 2039 Engine no. CNML 2086 Estimate £3,200-3,800
Auction information

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Buyers' Premium and Charges

For all Sales categories, buyer's premium excluding Cars, Motorbikes, Wine, Whisky and Coin & Medal sales, will be as follows:

Buyer's Premium Rates
27.5% on the first £10,000 of the hammer price;
25% of the hammer price of amounts in excess of £10,000 up to and including £450,000;
20% of the hammer price of amounts in excess of £450,000 up to and including £4,500,000;
and 14.5% of the hammer price of any amounts in excess of £4,500,000.

VAT at the current rate of 20% will be added to the Buyer's Premium and charges excluding Artists Resale Right.

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