AJS - Mod. 20 Spring Twin Carénage Peel
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AJS D2-492-08-14
Photo ou archives : F-M. Dumas

Capacity : 500
Model : Mod. 20 Spring Twin Carénage Peel
Production : 1950 - 1952
Category : (R) Street Bike


500 Spring Twin I Model20 – 1952

The number-one tourer of the Fifties

Despite the vast financial problems of the immediate postwar period, the British motorcycle industry reacted vigorously by immediately resuming production of high-quality "big bangers." After 1945 the merging of the leading British marques under the M1C (Associated Motorcycles Ltd) banner, which had begun as early as 1937, included AJS, Matchless, Francis-Barnett — and even Norton from 1952.

General Motor(cycle)s

The best features of each member company were available throughout the group, and by drawing on this organ bank, each marque could retain its individuality and produce a distinct range of models. In a smaller way, it was motorcycling's equivalent of the General Motors concept.

Peerless Power Unit

So it was that the AJS Spring Twin, powered by an engine developed by Matchless, made its debut in 1949. Following the lead set by Triumph in 1937, which was to be standard practice right up to the Seventies, the power unit of the "Ajay" was a parallel twin with a 360-degree firing interval, which meant that the pistons rose and fell together, the resulting vibrations generating an inimitable rhythm which gave such engines immense character. The competition-inspired "dustbin fairing" was an essential accessory of the period; it gave excellent protection but was highly susceptible to cross-winds.


Engine: Air-cooled 498cc (66x72.8mm) vertical twin

Valves: overhead

Fuel System: Single Amal carburettor

Transmission: 4-speed; chain final drive

Suspension: telescopic fork (front); swinging fork (rear)

Brakes: drum (front); drum (rear)

Wheels: 19in wire

For the past 30 years this A]S Spring Twin, fitted with a contemporary Peel fairing made in the Isle of Man, has transported its British owner on his annual camping holiday in France.

Motorcycle encyclopedia Moto Passion, realised by François-Marie Dumas, include almost 2000 photos presented with an exhaustive history of the motorcycles exhibited.

This unique collection has been realised with the participation of many specialists. With many thanks in particular to Yves Campion, Michael Dregni, Didier Ganneau, Jean Goyard, Helmut Krackowizer, Michel Montange, Christian Rey, Bernard Salvat, Mick Woollett, etc

One can order here

  • Original cards on paper (in french)
  • High resolution scans or original documents presented and signed with my name.

Please contact me at info@moto-collection.org for conditions and copyright.

© Tous droits réservés
François-Marie Dumas

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