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33-438: (Redirected from R-60 ) R60 may refer to: Automobiles [ edit ] BMW R60 , a motorcycle Mini Countryman (R60) , a sport utility vehicle Toyota Noah (R60) , a minivan Other uses [ edit ] R-60 (missile) , a Soviet air-to-air missile R60 (South Africa) , a road Aeryon SkyRanger R60 , an unmanned aerial vehicle R60: May impair fertility ,

66-438: A motorcycle 's front wheel and axle to its frame , typically via a yoke, also known as a triple clamp, which consists of an upper yoke joined to a lower yoke via a steering stem, a shaft that runs through the steering head, creating the steering axis. Most forks incorporate the front suspension and front brake, and allow the front wheel to rotate about the steering axis so that the bike may be steered. Most handlebars attach to

99-666: A commonly purchased option was a more bulbous 25 L (5.5 imp gal; 6.6 US gal) tank. Also available as options were sport tanks of 26 L (5.7 imp gal; 6.9 US gal) and 30 L (6.6 imp gal; 7.9 US gal) capacities. An oval shaped safety bar (photo right) was available for all 1955–69 BMW motorcycles from the American importer, Butler and Smith, New York. Engine Numbers Engine Power Transmission Electrical System Suspension Dimensions and Weights Performance Motorcycle fork A motorcycle fork connects

132-602: A matching girder fork. This Ariel girder fork is just as prone to brake dive as any telescopic fork, but is claimed to be more resistant to torsional twisting. The Saxon-Motodd fork (marketed as Telelever by BMW ) has a wishbone that mounts to the frame and supports the monoshock unit. This relieves the forks of any braking and suspension forces. With a Saxon-Motodd fork, the trail and caster angle ( rake ) increases during braking instead of decreasing as with traditional telescopic forks. BMW's boxer twins have been equipped with Telelever forks since 1994, but some newer boxers like

165-575: A risk phrase R60, a commuter rail service on the Llobregat–Anoia Line , in Barcelona, Catalonia, Spain R60, a Ferris wheel designed by Ronald Bussink [REDACTED] Topics referred to by the same term This disambiguation page lists articles associated with the same title formed as a letter–number combination. If an internal link led you here, you may wish to change the link to point directly to

198-448: A second journey. His book about the first trip, Two Wheels to Adventure (Alaska to Argentina by Motorcycle) , was published in 1989 with a second edition published in 2004. In the book " Zen and the Art of Motorcycle Maintenance ", John and Sylvia Sutherland accompany Robert Pirsig , the author, and his son Chris, on a 1968 road trip from Minnesota to San Francisco, riding a BMW R60. Throughout

231-541: A spotlight, metric tool kits, and a mechanical tachometer. U.S. motorcycles came standard with a narrow dual saddle, though wide dual saddles with chrome rear handles could be ordered. Solo saddles made by Pagusa or Denfeld for driver and passenger were also available. All motorcycles came with a tool kit. Hella turn signals were optional (photo below left), and were mounted at the ends of the handlebars showing light both forward and back. The standard fuel tank held 17 L (3.7 imp gal; 4.5 US gal), though

264-462: Is a variety of leading link fork where the pivot point is behind the front wheel, which is the basis of the Earles' patent. Patented by Englishman Ernest Earles in 1953, the design is constructed of light tubing, with conventional 'shock absorbers' mounted near the front axle. The Earles fork has a very small wheelbase change under braking or under compression, unlike telescopic forks. Their construction

297-434: Is available today on Harley-Davidson's Softail Springer . While it may have an exposed spring near the triple clamp, a springer fork is distinguishable from a girder fork by its two parallel sets of legs. The rear is firmly fixed to the bottom triple clamp (usually brazed or welded). A short leading link holds the wheel and the forward leg which actuates the springs (usually mounted on the triple clamp). The Earles fork

330-414: Is common with telescopic front forks. It also worked well in sidecar duty. Though heavy and ponderous in turning, the Earles fork gave the old Beemer a steady and reassuring ride. In 1968, BMW introduced telescopic forks on some of its slash-2 models, and they were continued into the 1969 model year. Modified, they became the front forks on the slash-5 models introduced for the 1970 model year. The photo of

363-498: Is distinguishable from a springer fork by the wheel being fixed firmly to the (usually a long diamond shape) upright. The pivot points are short links mounted to the top and bottom triple clamps. The spring is usually mounted to the girder and compressed against the upper triple clamp. Although girder forks are associated with early motorcycles, the British Ariel Ace , a modern sports motorcycle , has an alloy space frame and

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396-413: Is much stronger than teleforks, especially against lateral deflection caused by hard cornering (as when racing), or when cornering with a sidecar . This triangulated fork causes the front end of a motorcycle to rise slightly when braking hard, as the mechanical braking forces rotate 'downward' relative to the fork's pivot point. This action can be disconcerting to riders used to telescopic forks, which have

429-470: Is the most common form of fork commercially available. It may or may not include gaiters for protection against abrasive elements on the suspension cylinders. The main advantages of the telescopic fork are that (i) it is simple in design and relatively cheap to manufacture and assemble; (ii) it is lighter than older designs using external components and linkage systems; and (iii) it has a clean and simple appearance that bikers find attractive. Conventionally,

462-541: The BMW R nineT have reverted to conventional telescopic forks for aesthetic and packaging reasons. The Hossack/Fior fork (marketed as Duolever by BMW ) completely separates the suspension from steering forces. Developed by Norman Hossack and used by Claude Fior and John Britten on racebikes, Hossack described the system as a 'steered upright'. In 2004 BMW announced the K1200S with a new front suspension that appears to be based upon

495-686: The "US" designation, were designed primarily as rugged motorcycles to pull sidecars (mounting points were built in) and had duplex tubular steel frames. Simultaneously manufactured were related models, including the 500 cc R50 (1955–1960, 26 hp or 19 kW), the R50/2 (1960–1969, 26 hp), the R50 S (1960–1962, 35 hp or 26 kW), the R50US (1968–1969, 26 hp), and the 600 cc sport-oriented R69 (1955–1960, 35 hp), R69S (1960–1969, 42 hp or 31 kW), and R69US (1968–1969, 42 hp). In

528-467: The 1970s, historically there have been many variations, including trailing or leading link, springer, Earles, girder, and others, as well as non-fork steering such as hub-center steering . A variety of fork arrangements have been tried during more than one hundred years of motorcycle development, several of which remain available today. A telescopic fork uses fork tubes which contain the suspension components (coil springs and damper) internally. This

561-509: The U. S. typically were supplied with a single "dual" or bench saddle, either the standard size or a wide version that came with chrome rear-quarter passenger handles. Alternatives available included a Denfeld ( not "Denfield") or Pagusa solo driver's saddle, or individual driver and passenger saddles. BMW motorcycles of the 1960s were noted as long-distance touring motorcycles . However, none came standard with fairings or luggage; these items were provided by aftermarket vendors. Fairings included

594-506: The United States, all these Earles-fork and US-fork (i.e., telescopic fork) models from 1955 to 1969 are often lumped together as "Slash-2" BMWs, even though that is technically incorrect. Not all of them, as seen above, have the "/2" designation. Perhaps the most famous BMW rider of the 1960s was Danny Liska, who took R60 models from Alaska to Tierra del Fuego in one trip, and from Europe's North Cape to South Africa's Cape of Good Hope in

627-513: The Wixom Ranger handlebar-mounted fairing made in Illinois, and Avon. There were numerous manufacturers of saddle bags and top cases for BMW twins in the 1960s including Wixom, British-made Craven, and leather saddlebags imported by Butler and Smith, who also offered several styles of luggage carriers for mounting behinds the passenger saddle. It also offered several styles of windshields, safety bars,

660-479: The book Pirsig contrasts his passion and care in taking care of his bike to John's fear of technology: "The BMW is famous for not giving mechanical problems on the road and that's what he is counting on." Though BMW first used oil-damped telescopic front forks in the 1930s, it chose to use Earles forks on these models. The triangular front Earles fork, named after its designer, Englishman Ernest Earles, precluded any front-end dive during heavy front braking, which

693-513: The central location, coaxially within the steering tube. Ride height can be adjusted without loosening the forks in the triple clamps. This particular fork, as implemented on the MotoCzysz C1, also has adjustable trail, from 89 mm to 101 mm. There have been several attempts to implement front steering and suspension without using anything that could be described as a "fork". Examples include hub-center steering , used as early as 1920 on

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726-544: The design. As of 2006, the Duolever is on the BMW K models: K1200R , K1300R , K1200S , K1300S , K1200GT and K1300GT . Developed by MotoCzysz for their C1 and awarded United States Patent 7111700 on September 26, 2006. Defined as a motorcycle or bicycle front end having coaxial steering and suspension components, and having telescopic forks. Swing weight of the forks is dramatically reduced by removing their suspension components to

759-435: The fork stanchions are at the top, secured by a yoke (also called a triple tree or a triple clamp), and the sliders are at the bottom, attached to the front wheel spindle. On some modern sport bikes and most off-road bikes, this system is inverted, with "sliders" (complete with the spring/damper unit) at the top, clamped to the yoke, while the stanchions are at the bottom. This is done (i) to reduce unsprung weight by having

792-412: The girder fork consists of a pair of uprights attached to the triple clamp by linkages with a spring usually between the top and bottom triple clamps. The design reached a peak in the "Girdraulics" used on Vincent motorcycles from 1948. Girdraulic forks featured hydraulic damping with forged alloy blades providing extra strength. While both may have an exposed spring near the triple clamp, a girder fork

825-479: The handling while steering or braking. The most common example of a leading link fork is that found on the Honda Super Cub . The springer fork is an early type of leading link fork. A springer fork does not have the suspension built into the fork tubes, but instead has it mounted externally, where it may be integrated into the triple clamp. This style of fork may be found on antique motorcycles or choppers , and

858-484: The heavier components suspended, and (ii) to improve the strength and rigidity of the assembly by having the strong large-diameter "sliders" clamped in the yokes. The inverted system is referred to as an upside-down fork , or "USD" for short. A disadvantage of this USD design is that the entire reservoir of damping oil is above the slider seal so that, if the slider seal were to leak, the oil could drain out, rendering any damping ineffective. A trailing link fork suspends

891-624: The intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=R60&oldid=1147788934 " Category : Letter–number combination disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages BMW R60 Some 20,133 of these 600 cc shaft-drive, opposed twin R60 (1956–1960, 28 hp or 21 kW), R60/2 (1960–1969, 30 hp or 22 kW), and R60US (1968–1969, 30 hp) were built. These models, except for those with

924-443: The opposite reaction to braking forces ('brake dive'). Several motorcycle manufacturers licensed the Earles patent forks for racing motorcycles in 1953, such as MV Agusta and BMW Motorcycle , while other companies (such as Douglas motorcycle ) used the Earles design on their roadsters or off-road machines. BMW used Earles forks on all their motorcycles between 1955 and 1968. One of the earliest types of motorcycle front suspension,

957-531: The rear drive unit: many seals developed leaks. The front brakes were double leading shoes, and the rear had a single leading shoe. By modern standards, they were not good brakes. Tires, front and rear, were interchangeable in 3.50 inch by 18 inch size. Motorcycles sold in America had high handlebars with a cross brace. Those sold elsewhere came with low, Euro handlebars. A variety of saddle styles were available for these motorcycles. Those delivered in

990-402: The red R60US to the right was taken at a BMW dealership in 1968 and shows a brand-new motorcycle waiting for its first buyer. Earles fork and telescopic fork models both were manufactured for these two years and were available to customers. During the 1960s, very few motorcycles were available with shaft final drive. BMW's were the most common. The driveshaft rode in an enclosed oil bath within

1023-418: The right swingarm , unlike BMW's previous models, and drove the rear wheel through an internally splined cup that meshes with a coupler crown gear keyed to the drive pinion. This meant that leaking seals could become a problem for the owners. Because the clutch was dry, there were seals at the rear of the crankshaft, at both ends of the transmission, at the rear of the driveshaft, and at the front and rear of

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1056-466: The top clamp in various ways, while clip-on handlebars clamp to the fork tubes, either just above or just below the upper triple clamp. The fork and its attachment points on the frame establish the critical geometric parameters of rake and trail , which play a major role in defining how a motorcycle handles and dives during braking. While the standard telescopic fork arrangement is found with few major differences among mainstream street motorcycles since

1089-520: The wheel on a link (or links) with a pivot point forward of the wheel axle. Most famously used by Indian Motocycle ; it was also used by BMW for its early bikes. A leading link fork suspends the wheel on a link (or links) with a pivot point aft of the wheel axle. Russian Ural motorcycles used leading link forks on sidecar equipped motorcycles, and aftermarket leading link forks are often installed today on motorcycles when they are outfitted with sidecars. They are also very popular with trikes , improving

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