BSA M 21

⚠️ Things to consider

Weight: The BSA M21 is relatively heavy compared to contemporary motorcycles, which can make it less maneuverable, especially for new riders or in urban environments.Vibration: Riders often report noticeable vibrations at higher speeds, which can lead to discomfort on longer rides and affect overall ride quality.Limited Performance: While it has a decent engine for its time, the performance may feel lacking compared to modern motorcycles, especially in terms of acceleration and top speed.Maintenance: Finding replacement parts can be challenging due to the motorcycle's age, and some components may require specialized knowledge or tools for maintenance and repairs.Suspension: The suspension system may not offer the same level of comfort and handling as more modern bikes, making rides on rough or uneven surfaces less enjoyable. These factors should be considered by potential buyers or enthusiasts interested in the BSA M -

⚖️ Comparison & Competition

Norton Dominator 88 (1955)The Norton Dominator 88 was a popular parallel twin motorcycle that offered a blend of performance and style. With a 497cc engine, it provided a smooth and powerful ride, suitable for both city commuting and longer journeys. Its classic design and reliable engineering made it a favorite among enthusiasts.Triumph Thunderbird (1955)The Triumph Thunderbird was known for its robust performance and distinctive styling. Featuring a 649cc parallel twin engine, it delivered a combination of power and comfort. The Thunderbird was designed for cruising, making it a popular choice among riders looking for a classic British motorcycle with a bit of flair.Vincent Black Shadow (1955)The Vincent Black Shadow was a true legend in the motorcycle world, renowned for its speed and innovative engineering. With a 998cc V-twin engine, it was one of the fastest production motorcycles of its time. Its sleek design and performance capabilities made it a coveted model among collectors and speed enthusiasts alike.Ariel Square Four (1955)The Ariel Square Four was a unique motorcycle featuring a distinctive square four-cylinder engine layout. Known for its smooth operation and distinctive sound, it offered a comfortable ride and good performance for its era. Its innovative design and classic styling have made it a sought-after model among vintage motorcycle collectors.Matchless G80 (1955)The Matchless G80 was a single-cylinder motorcycle that offered a blend of simplicity and reliability. With its 500cc engine, it was a versatile bike suitable for a range of riding conditions, from daily commuting to weekend touring. The G80 was appreciated for its straightforward design and ease of maintenance, making it a practical choice for riders of all levels. These motorcycles, like the BSA M 21, represent a significant era in motorcycling history and offer a variety of experiences for enthusiasts

The BSA M 21 produces 15 HP, fitting A2 license limits (max 35 kW / 47 HP). For riders 18+.

Estimated average for 591cc class: 45-60 mpg (4.0-5.5 L/100km)

⛽ Tank: 11.36 litres (3.00 gallons)

Insurance grouping for BSA M 21 (591cc):

• 📋 Group 8-15 — mid-range
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Insurance Calculator (UK est.)

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Personalised premium estimate for the BSA M 21 (UK rates):

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Price Estimate

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Estimated price range for the BSA M 21 based on comparable motorcycles:

AVERAGE

$2,815

📊 Category-based (22 motorcycles) · Approximate (USD)

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Buy New & Used

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Find new and used BSA M 21 1955 listings:

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• 👤 Final premium varies by rider age, history, location.