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BMW R12 Single Carb
1935Allround

BMW R12 Single Carb

Key specifications

Engine
745 cc
Power
18 HP
Fuel type
petrol
Fuel capacity
3.7 L
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

Overview

### Discovering the 1935 BMW R12 Single Carb: A Classic Allrounder In the world of classic motorcycles, few models can claim the iconic status of the 1935 BMW R12 Single Carb. With its elegant design and robust engineering, the R12 was positioned as an allround motorcycle, appealing to both adventurous riders and those seeking reliable everyday transportation. As BMW's first series-produced motorcycle featuring a shaft drive, it represents a significant leap in motorcycle technology for its time, combining performance with practicality. The R12 not only captured the spirit of the era but also paved the way for future innovations within the BMW lineage. At the heart of the R12 is its powerful 745cc two-cylinder boxer engine, delivering a respectable 18 horsepower at 3,400 RPM. This four-stroke powerhouse produces a top speed of 110 km/h (68.4 mph), which was impressive for its day, allowing riders to confidently tackle both urban roads and country lanes. The bike’s 5.2:1 compression ratio and 25mm CK carburettor ensure smooth power delivery and efficient fuel consumption, boasting an economical 3.4 litres per 100 km (69.18 mpg). Riders will appreciate the R12's distinctive handling, thanks to its steel-pressed-loop frame, telescopic front fork, and rigid rear suspension, allowing for a balanced ride that gracefully absorbs the bumps of the road. What truly sets the R12 apart are its thoughtful features and the technology of its time. The expanding drum brakes, both front and rear, provide dependable stopping power, while the kick starter adds to its classic charm. The bike's design elements, such as its elegant lines and chrome accents, reflect the Art Deco influence of the 1930s, making the R12 a visual masterpiece as well as a mechanical one. With a fuel capacity of 14 litres (3.70 gallons), riders can enjoy longer journeys with fewer stops, enhancing the motorcycle's appeal as a true allrounder. ###

Pros

    Cons

    • Iconic Design: The R12's blend of vintage aesthetics with practical functionality makes it a sought-after classic among collectors and enthusiasts.
    • Reliable Performance: The boxer engine is known for its durability and smoothness, providing a dependable ride for various conditions.
    • Economical Fuel Consumption: With impressive fuel efficiency, the R12 allows for longer rides without frequent refueling, perfect for long-distance enthusiasts.
    • Limited Power Output: While adequate for its time, modern riders may find the power output on the lower side compared to contemporary motorcycles.
    • Rigid Rear Suspension: The lack of rear suspension may lead to a less comfortable ride on rough roads, which could deter some potential buyers.
    • Kick Start Only: The absence of an electric start means that riders need to be physically capable of kick-starting the engine, which can be a challenge for some.

    Technical details

    Source specification data

    Make
    BMW
    Model
    R12 Single Carb
    Category
    Allround
    Starter
    Kick
    Carrying Capacity
    300
    Power
    18.00 HP (13.1 kW)) @ 3400 RPM
    Ignition
    Magneto
    Top Speed
    110.0 km/h (68.4 mph)
    Fuel System
    Carburettor. CK 25mm
    Bore X Stroke
    78.0 x 78.0 mm (3.1 x 3.1 inches)
    Compression
    5.2:1
    Displacement
    745.00 ccm (45.46 cubic inches)
    Engine Details
    Two cylinder boxer, four-stroke
    Fuel Consumption
    3.40 litres/100 km (29.4 km/l or 69.18 mpg)
    Greenhouse Gases
    O2
    g/km. (
    O2
    -
    Carbon
    dioxide emission)
    Lubrication System
    Forced feed
    Fuel Capacity
    14.00 litres (3.70 gallons)
    Overall Width
    900 mm (35.4 inches)
    Overall Height
    940 mm (37.0 inches)
    Overall Length
    2,100 mm (82.7 inches)
    Seat
    Single seat
    Wheels
    Spoked
    Rear Tyre
    3.5-19
    Frame Type
    Steel-pressed-loop
    Front Tyre
    3.5-19
    Rear Brakes
    Expanding brake (drum brake)
    Front Brakes
    Expanding brake (drum brake)
    Rear Suspension
    Rigid-
    Front Suspension
    Telescopic fork
    Rear Brakes Diameter
    200 mm (7.9 inches)
    Front Brakes Diameter
    200 mm (7.9 inches)