BSA M 21

⚠️ Things to consider

• Limited Power Output: The BSA M21 is equipped with a relatively low-powered engine, which may not provide the performance or acceleration that some riders expect from a motorcycle, particularly when compared to more modern alternatives.
• Weight: The motorcycle is quite heavy, which can make it less maneuverable and more challenging to handle, especially for less experienced riders or in urban environments.
• Vibration: Riders may experience significant engine vibration at higher speeds, which can lead to discomfort during longer rides and may detract from the overall riding experience.
• Parts Availability: As a vintage motorcycle, sourcing replacement parts can be difficult, potentially leading to longer downtime for repairs and maintenance compared to more contemporary models.
• Braking Performance: The braking system on the BSA M21 is less advanced compared to modern motorcycles, which may result in longer stopping distances and reduced overall safety, especially in emergency situations.

⚖️ Comparison & Competition

• Norton Model 7 (1949-1953) The Norton Model 7, also known as the Norton Dominator, is a parallel twin motorcycle that features a 497cc engine. Known for its smooth performance and reliable handling, it combines classic styling with advanced engineering for its time, making it a popular choice among British bike enthusiasts.
• Triumph Thunderbird (1950-1959) The Triumph Thunderbird is a 649cc parallel twin motorcycle that gained fame for its robust performance and distinctive design. With a focus on comfort and long-distance cruising, the Thunderbird became a favorite of many riders looking for both style and substance in the post-war era.
• AJS Model 20 (1945-1955) The AJS Model 20 is a 500cc single-cylinder motorcycle characterized by its classic design and reliable performance. Known for its versatility, the Model 20 was suitable for both commuting and light touring, appealing to riders who appreciated a balance of practicality and vintage aesthetics.
• Matchless G80 (1948-1965) The Matchless G80 is a 500cc single-cylinder motorcycle that offers a blend of performance and charm. With its distinctive styling and solid construction, the G80 was designed for both urban riding and rural adventures, making it a popular model during the 1950s.
• Royal Enfield Bullet (1931-present) The Royal Enfield Bullet is one of the longest-running motorcycle models in history, with a simple yet rugged design. The 1953 variant featured a 350cc or 500cc single-cylinder engine, known for its reliability and ease of maintenance. Its timeless appeal continues to attract classic motorcycle enthusiasts to this day. These alternatives reflect the diverse offerings of British motorcycles in the early 1950s, each with its unique character and charm

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 1953 listings:

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