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BMW R12 Twin carb
1935Sportbike

BMW R12 Twin carb

Key specifications

Engine
745 cc
Power
20 HP
Fuel type
petrol
Fuel capacity
3.7 L
Transmission
4-speed
Front brakes
Expanding brake (drum brake). Single
Rear brakes
Expanding brake (drum brake)

Overview

### The Classic Charm of the 1935 BMW R12 Twin Carb The 1935 BMW R12 Twin Carb stands as a testament to the pioneering spirit of early 20th-century motorcycle engineering. Positioned as a sport motorcycle in its time, the R12 was designed to cater to the growing demand for performance and speed among motorcycle enthusiasts. With its sleek lines and iconic BMW styling, it is not just a machine but a piece of history that collectors and riders alike treasure. Its innovative design and engineering prowess laid the groundwork for future BMW models, making it a revered classic in the motorcycle community. At the heart of the R12 lies a robust 745cc two-cylinder boxer engine, delivering a respectable 19.99 horsepower at 4000 RPM. This four-stroke powerhouse allows the R12 to reach a top speed of 120 km/h (74.6 mph), showcasing its capability as a spirited sport motorcycle. The boxer engine configuration not only contributes to a lower center of gravity, enhancing stability, but also provides a unique riding experience characterized by its distinctive engine pulse. With a compression ratio of 5.2:1 and a fuel consumption of 4.5 liters per 100 km (52.27 mpg), the R12 demonstrates an impressive balance of performance and efficiency, making it a joy to ride on both long journeys and spirited escapades. The R12 is equipped with several key features that reflect the cutting-edge technology of its time. Its steel double cradle frame ensures durability and rigidity, while the cartridge front suspension contributes to a smoother ride over uneven terrain. The combination of expanding drum brakes at both the front and rear provides reliable stopping power, essential for navigating the fast-paced roads of the era. With a fuel capacity of 14 liters, riders could embark on extended adventures, fueled by a kick starter that adds a touch of authenticity to the vintage experience. The R12 not only embodies the spirit of adventure but also showcases the meticulous craftsmanship that BMW is renowned for. ####

Pros

    Cons

    • Iconic Design: The classic styling and unmistakable BMW aesthetics make the R12 a standout piece in any motorcycle collection.
    • Unique Engine Configuration: The boxer engine provides a distinctive riding experience and enhances stability, making it enjoyable to ride.
    • Efficient Fuel Consumption: With impressive mileage, the R12 allows for longer rides without frequent fuel stops.
    • Limited Power Output: While adequate for its time, the 19.99 HP may not satisfy modern riders seeking high-performance motorcycles.
    • Drum Brakes: The expanding drum brakes, though functional, are less effective than contemporary disc brakes, potentially limiting braking performance.
    • Rigid Rear Suspension: The rigid rear design can lead to a harsher ride on bumpy roads compared to modern motorcycles with advanced suspension systems.

    Technical details

    Source specification data

    Make
    BMW
    Model
    R12 Twin carb
    Category
    Sport
    Starter
    Kick
    Carrying Capacity
    300
    Power
    19.99 HP (14.6 kW)) @ 4000 RPM
    Clutch
    Dry multiplate-cable operated
    Gearbox
    4-speed
    Top Speed
    120.0 km/h (74.6 mph)
    Fuel System
    Carburettor. Amal
    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)
    Cooling System
    Air
    Engine Details
    Two cylinder boxer, four-stroke
    Fuel Consumption
    4.50 litres/100 km (22.2 km/l or 52.27 mpg)
    Greenhouse Gases
    O2
    g/km. (
    O2
    -
    Carbon
    dioxide emission)
    Lubrication System
    Wet sump
    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)
    Weight Incl Oil Gas Etc
    185.0 kg (407.9 pounds)
    Seat
    Spring-mounted seat
    Rear Tyre
    3.5-19
    Frame Type
    Steel-doble cradle
    Front Tyre
    3.50-19
    Rear Brakes
    Expanding brake (drum brake)
    Front Brakes
    Expanding brake (drum brake). Single
    Rear Suspension
    Rigid-
    Front Suspension
    Cartrige
    Front Brakes Diameter
    200 mm (7.9 inches)