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AJS Model 20 500
1955Allround

AJS Model 20 500

Key specifications

Engine
498 cc
Power
20 HP
Weight
178 kg
Fuel type
petrol
Fuel capacity
3.6 L
Transmission
4-speed
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

Overview

Introducing the 1955 AJS Model 20 500: A Classic Allrounder Step into the golden age of motorcycling with the 1955 AJS Model 20 500, a quintessential allround motorcycle that effortlessly blends vintage charm with robust performance. AJS, a name revered in the annals of motorcycle history, positioned the Model 20 as a versatile machine that catered to both commuting and leisurely rides. Its classic lines, combined with a powerful yet manageable engine, make it a sought-after gem for collectors and enthusiasts alike. Whether you're navigating city streets or cruising along winding country roads, the Model 20 invites you to experience the freedom and thrill of the open road. Engine Performance and Riding Characteristics At the heart of the AJS Model 20 is a spirited 498cc twin four-stroke engine, delivering a respectable 20 horsepower at 6,800 RPM. With a compression ratio of 7.0:1 and an impressive top speed of 137 km/h (85.1 mph), this motorcycle offers a delightful mix of power and agility. The 4-speed gearbox allows for smooth gear transitions, enhancing the riding experience, while the air-cooled design ensures reliability on long journeys. Riders will appreciate the Model 20’s nimble handling and the engaging feedback from its wet multiplate clutch, making every ride an exhilarating adventure that harks back to the golden era of motorcycling. Key Features and Technology The AJS Model 20 is a testament to mid-20th century engineering, showcasing features that were ahead of their time. The single cradle frame supports a classic telescopic front suspension and twin-shock rear suspension, providing a balanced ride whether traversing city streets or country lanes. With drum brakes on both the front and rear, the Model 20 delivers reliable stopping power, allowing riders to confidently navigate various terrains. The 13.5-liter fuel tank strikes a perfect balance between capacity and weight, ensuring that you can enjoy longer rides without frequent stops. Coupled with the nostalgic kickstarter, the Model 20 encapsulates the essence of classic motorcycling, evoking a sense of nostalgia for the enthusiast. **

Pros

    Cons

    • Classic Styling: The vintage aesthetic appeals to enthusiasts and collectors, making it a standout on the road.
    • Versatile Performance: With a balanced power-to-weight ratio, it excels in both city commuting and longer rides.
    • Reliable Engineering: AJS's reputation for durability means this motorcycle is built to last, with well-proven components.
    • Limited Speed: While capable, the power may feel modest for riders seeking high-performance thrills.
    • Brake Performance: Drum brakes, though reliable, may not offer the stopping power and responsiveness of modern disc brakes.
    • Kickstarter Only: The absence of an electric start can be a hurdle for some riders, especially in colder conditions.

    Technical details

    Source specification data

    Make
    AJS
    Model
    Model 20 500
    Category
    Allround
    Starter
    Kick
    Power
    20.00 HP (14.6 kW)) @ 6800 RPM
    Clutch
    Wet multiplate
    Gearbox
    4-speed
    Ignition
    Magneto
    Top Speed
    137.0 km/h (85.1 mph)
    Fuel System
    Carburettor
    Bore X Stroke
    66.0 x 72.8 mm (2.6 x 2.9 inches)
    Compression
    7.0:1
    Displacement
    498.00 ccm (30.39 cubic inches)
    Cooling System
    Air
    Engine Details
    Twin, four-stroke
    Transmission Type Final Drive
    Chain
    Dry Weight
    178.0 kg (392.4 pounds)
    Fuel Capacity
    13.50 litres (3.57 gallons)
    Overall Width
    710 mm (28.0 inches)
    Overall Length
    2,190 mm (86.2 inches)
    Power Weight Ratio
    0.1124 HP/kg
    Seat
    Dual
    Wheels
    Spoked
    Rear Tyre
    3.25-19
    Frame Type
    Single cradle
    Front Tyre
    3.25-19
    Rear Brakes
    Expanding brake (drum brake)
    Front Brakes
    Expanding brake (drum brake)
    Rear Suspension
    Twin shock
    Front Suspension
    Telescopic