Back to Bike FinderYears: 1941 · 1940 · 1939 · 1938
BMW R66
1939Allround

BMW R66

Key specifications

Engine
596 cc
Power
30 HP
Fuel type
petrol
Fuel capacity
3.7 L
Transmission
4-speed
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

Overview

Introducing the 1939 BMW R66, a striking embodiment of pre-war engineering excellence that holds a revered position in the annals of motorcycle history. As a member of BMW's allround category, the R66 was designed to cater to the diverse needs of riders, whether they sought spirited excursions through the countryside or reliable commuting in urban settings. With its distinctive boxer engine configuration and classic styling, the R66 not only captivated the hearts of enthusiasts at the time but also laid the groundwork for BMW's enduring legacy in motorcycle manufacturing. At the heart of the R66 lies a robust 596 cc two-cylinder boxer engine, delivering a commendable 30.05 horsepower at 5,300 RPM. This four-stroke powerhouse provides a thrilling ride, with a top speed of 145 km/h (90.1 mph) that was impressive for its era. The engine's air-cooling system and 6.8:1 compression ratio work in harmony to ensure reliability and performance, while the 4-speed gearbox allows smooth shifts for a fluid riding experience. The R66’s balanced chassis and suspension system, featuring a double steel loop frame and twin shock swingarm at the rear, provide stability and comfort, making it an ideal companion for both leisurely rides and spirited adventures. The R66 is not just about performance; it’s also a showcase of advanced technology for its time. The motorcycle features a kick starter system, a classic touch that invokes nostalgia and reminds riders of the simplicity of earlier machines. Its 14-liter fuel tank ensures that riders can cover considerable distances without frequent stops, while the 200 mm drum brakes, both front and rear, offer reliable stopping power, albeit with the characteristic feel of vintage braking systems. The bike's elegant lines, complemented by a timeless design, make it a true head-turner as it glides down the road. Pros: - Classic Boxer Engine: The two-cylinder boxer engine not only provides a unique aesthetic but also delivers a smooth and powerful ride. - Timeless Design: The R66 features a vintage aesthetic that appeals to motorcycle enthusiasts and collectors alike, ensuring it stands out in any crowd. - Robust Performance: With a respectable top speed and solid handling, the R66 excels in both city commuting and countryside cruising. Cons: - Limited Braking Efficiency: While the drum brakes are adequate for the time, they may not provide the stopping power and responsiveness expected by modern riders. - Kick Start Only: The absence of an electric starter can be cumbersome for some, especially in urban settings where frequent stops are common. - Weight Considerations: At 187 kg (412.3 lbs), it might feel cumbersome for newer riders or those accustomed to lighter models, impacting maneuverability in tight spaces. The 1939 BMW R66 is more than just a motorcycle; it's a slice of history, a blend of innovation and tradition that continues to inspire awe and admiration among enthusiasts. Whether you're a collector, a vintage motorcycle aficionado, or someone simply drawn to its elegant lines, the R66 promises an engaging ride steeped in the legacy of one of the most prestigious names in motorcycling.

Technical details

Source specification data

Make
BMW
Model
R66
Category
Allround
Starter
Kick
Carrying Capacity
210kg-500kg with sidecar
Power
30.05 HP (21.9 kW)) @ 5300 RPM
Clutch
Dry-single plate-cable operated
Gearbox
4-speed
Ignition
Batery
Top Speed
145.0 km/h (90.1 mph)
Fuel System
Carburettor. 26mm
Bore X Stroke
69.8 x 78.0 mm (2.7 x 3.1 inches)
Compression
6.8:1
Displacement
596.00 ccm (36.37 cubic inches)
Cooling System
Air
Engine Details
Two cylinder boxer, four-stroke
Lubrication System
Wet sump
Transmission Type Final Drive
Shaft drive (cardan)
Fuel Capacity
14.00 litres (3.70 gallons)
Overall Width
815 mm (32.1 inches)
Overall Height
960 mm (37.8 inches)
Overall Length
2,130 mm (83.9 inches)
Weight Incl Oil Gas Etc
187.0 kg (412.3 pounds)
Seat
Single seat
Rear Tyre
3.5-19
Frame Type
Doble steel loop
Front Tyre
3.5-19
Rear Brakes
Expanding brake (drum brake)
Front Brakes
Expanding brake (drum brake)
Rear Suspension
Twin shock-Swingarm
Front Suspension
Cartridge
Rear Brakes Diameter
200 mm (7.9 inches)
Front Brakes Diameter
200 mm (7.9 inches)