BMW /5 motorcycles

Last updated
BMW /5 motorcycles
Manufacturer BMW
Also calledR50/5, R60/5, and R75/5
Production1969-1973
Assembly Berlin, Germany
Engine 500-750cc
Bore / stroke 70.6 mm
Top speed110mph
Power 32-50hp
Torque 29-43ft⋅lbf
Transmission 4-speed
Suspension Modular
Brakes Front/Rear Drum Brake
Tires 3.25x19 front • 4.00x18 rear
Wheelbase 1385 mm
DimensionsL: 2100 mm
W: 850 mm
H: 1040 mm
Weight462 lbs (wet)
Fuel capacity4.7 US gal
BMW R75/5 BMW R75-5 r TCE.jpg
BMW R75/5

For the WWII-era motorcycle, see BMW R75

BMW R60/5 (with BMW R80GS behind) Munich06-2 018 (345606602).jpg
BMW R60/5 (with BMW R80GS behind)

The BMW R50/5, R60/5, and R75/5 form a range of boxer twin motorcycles manufactured in Berlin, Germany, by BMW for model years 1970-1973 and featuring electric starting and telescopic forks.

Contents

History

R75/5 tank roundel R75-5-400.jpg
R75/5 tank roundel
BMW R75/5 with "toaster" side-panels R75-800.jpg
BMW R75/5 with "toaster" side-panels

For the 1970 model year, BMW launched three new models having engine capacities of 500 cc (R50/5), 600 cc (R60/5), and 750 cc (R75/5). The R75/5 could reach 110 mph (177 km/h). [1] [ failed verification ] Model year 1972 saw the introduction of the 15 L (3.3 imp gal; 4.0 US gal) rectangular tank with chrome side panels. For the second half of the 1973 model year, BMW lengthened the rear swingarm 2 inch (5 cm), resulting in the “long-wheelbase” (LWB) models mainly to improve the stability of the motorcycles at higher speeds and when loaded up. It also enabled a larger battery, while retaining the kick starter.

The /5 series was the first series to be manufactured completely in Berlin,[ citation needed ] as by 1969 all of Munich's production capacity was needed for automobiles. "Berlin with its well-trained workforce was an obvious choice. So in 1969 the Berlin Plant started production of the all-new BMW /5 Series, a completely new design and construction following a modular principle all the way from the suspension to the flat-twin power unit. [2]

In 1970, 12,287 units were manufactured and by July 1973, when the /5 model series reached the end production, a significant volume of 68,956 motorcycles had left the Berlin Plant, production increasing five-fold within three years. During this period, BMW manufactured its 500,000th. [2]

In 1974, BMW introduced the “/6” models, which offered front disc brake, revised instrumentation, and a five-speed transmission. The single disc brake was a hybrid cable/hydraulic system, whereby a cable from the handlebar lever actuated the master cylinder underneath the fuel tank. The rectangular tank was dropped.

All /5 models featured both electric starter and kickstarter, [3] with kickstarters remaining available on some BMW motorcycles up to model year 1980.

Technical data

Boxer engine showing offset cylinders R75-boxer.jpg
Boxer engine showing offset cylinders

The /5 models are air-cooled, four-stroke, opposed-twin (boxer) engines with hemispherical combustion chambers. The engine is built around a one-piece tunnel crank-case. The camshaft is driven by a duplex chain and is located below the crankshaft (unlike the /2 series which had the gear-driven camshaft above the crank). This reversed arrangement improves ground clearance for the same center of gravity and assists lubrication of the camshaft. Valves are actuated by the camshaft through hardened followers, push rods, and rocker arms.

The 500 cc and 600 cc models are equipped with Bing slide-type carburetors with 26 mm throats. The R75/5 comes with 32 mm Bing CV (Constant Vacuum/constant depression) type carburetors. [4] As in all BMW motorcycles at the time, the clutch is a single-disk dry clutch.

Final drive is by shaft, running from the transmission by universal joint to an oil bath within the right rear swing arm and connecting to a bevel gear and ring gear on the other end. Unlike the /2 models (with the exception of the 1968-69 US models), the /5 models are equipped with telescopic front forks, 12-volt alternator and electrics, and standard tachometer and turn signals.

 R 50/5R 60/5R 75/5
Bore67 mm (2.6 in)73.5 mm (2.89 in)82 mm (3.2 in)
Stroke70.6 mm (2.78 in)
Displacement498 cc (30.4 cu in)599 cc (36.6 cu in)749 cc (45.7 cu in)
Power32 hp (24 kW) @ 6,800 rpm[ citation needed ]40 hp (30 kW) @ 6,600 rpm[ citation needed ]50 hp (37 kW) @ 6,400 rpm[ citation needed ]
Torque29 ft⋅lbf (39 N⋅m) @ 5,000 rpm[ citation needed ]36 ft⋅lbf (49 N⋅m) @ 5,000 rpm[ citation needed ]43 ft⋅lbf (58 N⋅m) @ 5,000 rpm[ citation needed ]
Top Speed87 mph (140 km/h)[ citation needed ]99 mph (159 km/h)[ citation needed ]110 mph (175 km/h)[ citation needed ]
Curb Weight 452 lb (205 kg)[ citation needed ]463 lb (210 kg)[ citation needed ]463 lb (210 kg)[ citation needed ]
Gross Weight Rating 881 lb (400 kg)
AlternatorBosch 12 V • 180 Watts
Spark PlugsBosch W230T30 / Champion N7Y
Fuel Tank4.7 US gal (18 L; 3.9 imp gal) or 6.3 US gal (24 L; 5.2 imp gal)
Tires3.25x19 front • 4.00x18 rear
Rims1.85x19 front • 1.85x18 rear
DimensionsDimensions/Weights
Dimensions/Weights

Length x Width x Height

Dimensions/Weights

2100 (from 1973: 2150) x 850 x 1040 mm (82.67 (84.64) x 33.46 x 40.94 in)

Dimensions/Weights

Wheel Base

Dimensions/Weights

1385 mm / 54.52 in (from 1973: 1435 mm / 56.49 in)

BMW R75/5 with pannier Right-3qtr-bagsmall.jpg
BMW R75/5 with pannier

See also

Related Research Articles

<span class="mw-page-title-main">History of BMW motorcycles</span> Aspect of history

BMW's motorcycle history began in 1921 when the company commenced manufacturing engines for other companies. BMW's own motorcycles—sold under the BMW Motorrad brand—began in 1923 with the BMW R 32, which was powered by a flat-twin engine. Production of motorcycles with flat-twin engines continues to this day, however BMW has also produced many models with other types of engines.

The Honda XR series is a range of four-stroke off-road motorcycles that were designed in Japan but assembled all over the world.

<span class="mw-page-title-main">Suzuki GS series</span> Series of motorcycles

The Suzuki GS series was Suzuki Motor Corporation's first full range of 4-stroke powered road motorcycles, having previously almost exclusively manufactured 2-stroke machines. Suzuki had produced the 4-stroke Colleda COX 125cc and 93cc 4-stroke single-cylinder machines in 1955 however the rest of Suzuki's production from 1952 to 1976 had been increasingly sophisticated two-stroke road machines, whose ultimate expression was the 750cc 3-cylinder water-cooled GT750.

<span class="mw-page-title-main">Yamaha XS 650</span> Yamaha motorcycle

The Yamaha XS650 is a mid-size motorcycle made by Yamaha Motor Company. The standard model was introduced in October 1969,and produced through 1979. The "Special" cruiser model was introduced in 1978 and produced through 1985. The XS650 began with the 1955 Hosk SOHC 500 twin. After about 10 years of producing 500 twin, Hosk engineers designed a 650 cc twin. Later the Hosk company was acquired by Showa Corporation, and in 1960 Yamaha had bought Showa with Hosk's early design of 650 cc twin.

<span class="mw-page-title-main">Motorcycle engine</span> Engine that powers a motorcycle

A motorcycle engine is an engine that powers a motorcycle. Motorcycle engines are typically two-stroke or four-stroke internal combustion engines, but other engine types, such as Wankels and electric motors, have been used.

<span class="mw-page-title-main">BMW R90S</span> Type of motorcycle

The BMW R90S is a 900cc sport motorcycle produced by BMW from 1973 to 1976. BMW commissioned designer Hans Muth to oversee the R90S, which became the flagship of the boxer engined "/6" range. Sporting distinctive two-tone paintwork, a bikini fairing and a new tail, the R90S was intended to shrug off the enduring image of BMW bikes as staid and utilitarian.

The Killinger and Freund Motorcycle was an attempt in 1935 by a group of five German engineers from Munich to design a more streamlined and modified version of the German Megola front-wheel drive motorcycle. The work took three years to complete but the result was impressive. The engine displacement stayed the same as the Megola at 600 cc but was much lighter and more simplified than a standard 100 cc motorcycle of the time.

<span class="mw-page-title-main">Ducati L-twin engine</span>

The L-twin is a naturally aspirated two-cylinder petrol engine by Ducati. It uses a 90-degree layout and 270-degree firing order and is mounted with one cylinder horizontal.

<span class="mw-page-title-main">BMW R60/2</span> Type of motorcycle

The R60 and R60/2 are 600 cc boxer-twin that were manufactured from 1956 to 1969 in Munich, Germany, by BMW.

<span class="mw-page-title-main">BMW R69S</span> Type of motorcycle

The R69S, R69US, and R69 are motorcycles, fitted with 594 cc boxer twin engines, that were manufactured by BMW in Munich, Germany.

<span class="mw-page-title-main">Norton Commando</span> British motorcycle produced from 1967 to 1977

The Norton Commando is a British Norton-Villiers motorcycle with an OHV pre-unit parallel-twin engine, produced by the Norton Motorcycle company from 1967 until 1977. Initially having a nominal 750 cc displacement, actually 745 cc (45.5 cu in), in 1973 it became an 850 cc, actually 828 cc (50.5 cu in). It had a hemi-type head, similar to all OHV Norton engines since the early 1920s.

<span class="mw-page-title-main">BMW R27</span> Type of motorcycle

The 247 cc BMW R27, introduced in 1960, is a shaft-driven, single-cylinder motorcycle manufactured by BMW.

<span class="mw-page-title-main">BMW R75</span> World War II-era motorcycle and sidecar

The BMW R75 is a World War II-era motorcycle and sidecar combination produced by the German company BMW. The BMW R75 stands out by its integral two-wheel drive design, with drive shafts to both its rear wheel and the third side-car wheel, from a locking differential, as well as a transfer case offering both road and off-road gear ratios, through which all forward and reverse gears worked. This made the R75 highly manoeuvrable and capable of negotiating most surfaces. A few other motorcycle manufactures, like FN and Norton, offered optional drive to sidecars.

<span class="mw-page-title-main">Harley-Davidson XA</span> Type of motorcycle

The Harley-Davidson XA was a flat-twin, shaft drive motorcycle made by Harley-Davidson for the US Army during World War II.

BMW Motorrad is the motorcycle brand and division of German automotive manufacturer, BMW. It has produced motorcycles since 1923, and achieved record sales for the fifth year in succession in 2015. With a total of 136,963 vehicles sold in 2015, BMW registered a growth of 10.9% in sales in comparison with 2014. In May 2011, the 2,000,000th motorcycle produced by BMW Motorrad was an R1200GS.

<span class="mw-page-title-main">BMW R80G/S</span> Motorcycle

The BMW R 80 G/S is a motorcycle that was manufactured in Berlin, Germany, by BMW Motorrad from 1980 to 1987. Production totalled 21,864 bikes. It was the first in the BMW GS family of specialised dual-sport bikes, of which over 500,000 have been produced, and is often considered the world's first "Adventure Bike" able to be equally capable on and off road. The designation G/S stands for the German words Gelände/Straße, which mean offroad/road – highlighting the bike's dual sport design.

<span class="mw-page-title-main">BMW R2</span> Type of motorcycle

The BMW R2 was a 198 cc overhead valve single-cylinder motorcycle produced by BMW between 1931 and 1936, the smallest motorcycle ever to enter series production with the firm. Despite its much smaller design and engine capacity, the R2 retained many features of the larger boxer twin motorcycles in the range, such as cardan shaft drive and a pressed-steel duplex frame. The R2 was the smallest in the range of singles produced during the 1930s by BMW, with its big brothers being the 305 cc R3 and the 400 cc R4.

<span class="mw-page-title-main">BMW R1100S</span> Type of motorcycle

The BMW R1100S is a sports motorcycle that was manufactured by BMW Motorrad between 1998 and 2005. Introduced some 25 years after the R90S, the company's first sports bike, the R1100S was the first BMW bike having clip-on handlebars, rearset footrests and a removable cowl to cover the pillion seat. Producing nearly 100 hp, it has been described as a "sporty sports-tourer".

<span class="mw-page-title-main">BMW R100</span> Type of motorcycle

BMW R100, with variant models designated by T, S, CS, RS, RS Classic, RT, RT Classic, TIC, TC, R and GS is a BMW motorcycle series, using a two-cylinder four-stroke boxer engine of 980 cc capacity. Model production began in 1976, with a premature shutdown and subsequent restart in 1985, and final completion of the series in 1996.

<span class="mw-page-title-main">BMW /6 motorcycles</span>

The BMW R60/6, R75/6, R90/6 and the sport model BMW R90S form a range of boxer twin motorcycles that were manufactured in Berlin, Germany, by BMW from 1974 to 1976. The "slash six" models departed from the earlier "slash five" slightly. First, the smallest displacement changed from 500cc to 600cc. A sport model was offered, as were disc brakes for the first time. Additionally, the tank design was changed to remove the chrome trim panels, and the gauge pod was moved from the headlight housing to its own assembly over the housing.

References

  1. "Home". eecs.umich.edu.
  2. 1 2 "Forty Years of BMW Motorcycle Production in Berlin-Spandau". Archived from the original on 2011-07-16. Retrieved 2009-06-22.
  3. Falloon, Ian (2003). Original BMW Air-Cooled Boxer Twins 1950-1996. MotorBooks International. ISBN   978-0-7603-1424-1.
  4. Richard Backus (November–December 2009). "10 Days with a 1973 BMW R75/5". Motorcycle Classics. Archived from the original on 8 November 2009. Retrieved 2009-11-11.