Types of motorcycle frames pdf

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Types of motorcycle frames pdf

As early as s emerged many designs and machines.

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Since then, generation after generation introduced new designs to the market. Below is a list of frames that evolved throughout generations. Motorcycle frame can be compared to a skeleton that holds the human body. The motor frame serves the same way, it holds together all the parts of the motorcycle in a rigid built. The benefits of using an advance frame design lies in the sporty handling characteristics.

When you have a well-designed frame, it adds up to the great experience of riding. With new frames being introduced, more and more riders are upgrading. Even dentists Traverse City are opting to get a motorcycle for easier transportation.

The frame makes the rider feel stable and ride without much of the effort. There are various types of motorcycle frames, and each of them has a great advantage of its own. Not best frame there is. This frame is one of the common frame. This is usually seen for indian motorcycles.

types of motorcycle frames pdf

It took its name from its shape. It has a simple built and does not cost much. A bonus feature is that it is light weight.

types of motorcycle frames pdf

The structure of this frame is almost the same as the diamond frame however it is built together with the toptube or backbone, and down tubes. These runs down towards the engine. It is put together by welding pipes into a cage arrangement. There is no cradle elements, downtube or even backbone in this frame.

It is lightweight that makes handling so much better. This frame is known as Twin Spar or beam frames. The engine is suspended from the frame and it can be held around in perimeter of frame. The panels form the chassis and no other separate frame. No other separate frames added but other parts like air-box and engine form a part of the chassis.

Benefits and Types of Motorcycle Frames As early as s emerged many designs and machines. Motorcycle Frame Assembly What is a motorcycle Frame?

motorcycle frames

This is the list of frames being used for motorcycles Backbone Frame Not best frame there is. Diamond Frame This frame is one of the common frame. Cradle Frame The structure of this frame is almost the same as the diamond frame however it is built together with the toptube or backbone, and down tubes. Trellis Frame It is put together by welding pipes into a cage arrangement. It is lightweight that makes handling so much better Perimeter Frame This frame is known as Twin Spar or beam frames.

Monocoque Frame The panels form the chassis and no other separate frame. How Affordable is Motorsport Marketing?If you are going to build a motorcycle, the frame determines the basic look of the bike. Of course motorcycle frames affect not only the appearance of the bike but the handling and safety of the finished machine. Frames are the basic skeleton to which other components are attached. They hold the motorcycle tanks and engine and provide support to the whole bike.

Most frames are made of steel or aluminum but there are also other choices such as carbon-fibre. Motorcycle frames generally fall into one of several categories. Single Cradle: This is the simplest of the motorcycle frames, a design that harks back to some of the earliest motorcycles ever made. It has a single large tube for a spine and smaller tubes that cradle the engine.

This is commonly used on off-road bikes. A variation is the split single cradle which is a single cradle that splits into two cradles at the back for the exhaust. Double Cradle: An evolution of the single cradle, it uses two cradles on either side to hold the engine. These were commonly used on simple road bikes and some custom bikes, but have mostly been supplanted by perimeter frames.

Backbone: These are specialty frames that are used rarely. It has a solid metal backbone and the engine hangs suspended from this. It's a simple and inexpensive frame with a distinctive look, but other designs are better in terms of strength and rigidity. Perimeter: These frames originated on racing motorcycles. The steering head and swingarm are joined at a very short distance, reducing flexure and torsion substantially.

They were originally made from steel but most are made from aluminum nowadays to save weight. Once the advantages of this frame were seen, they were adopted by most motorcycle manufacturers. Monocoque: Another specialty frame that is even rarer than the backbone. They are very heavy and rigid, combining seat mounting, tank, and tail into a single sturdy piece of metal. They are used almost exclusively on specialized competition bikes and are not a good choice for street bikes.

Trellis: European manufacturers came up with this design although it is catching on in the US as well. It uses many of the same construction principles as the perimeter frame and matches it in rigidity and weight. Its distinctive look is formed by a "trellis" of short tubes that make up the body of the frame.

It requires more effort to manufacture than the perimeter but the result is extremely strong.A motorcycle frame is a motorcycle's core structure.

It supports the engine, provides a location for the steering and rear suspensionand supports the rider and any passenger or luggage. Also attached to the frame are the fuel tank and battery.

At the front of the frame is found the steering head tube that holds the pivoting front forkwhile at the rear there is a pivot point for the swingarm suspension motion.

Benefits and Types of Motorcycle Frames

Some motorcycles [1] include the engine as a load-bearing stressed member; while some other bikes do not use a single frame, but instead have a front and a rear subframe attached to the engine.

In the early days, motorcycles were little more than motorised bicyclesand consequently frames were tubular steel. While the use of steel tubing is still common, in modern times other materials, such as titaniumaluminiummagnesiumand carbon-fibrealong with composites of these materials, are now used.

As different motorcycles have varying design parameters such as cost, complexity, weight distributionstiffness, power output and speedthere is no single ideal frame design, and designers must make an informed decision of the optimum choice. In Europe and the USA, steel tubing was the default material until recent times.

The motorcycle engine is held in place within a pair of separate cradles. The Norton Featherbed frame was the classic example, but many "duplex" frames actually have a single spine beneath the tank. Also called Beam or twin spartwo beams wrap around the engine to join the steering head and swing arm in the shortest distance possible for better rigidity.

The trellis frame employs the same concept but uses welded members to form a trellis instead of pressed metal. The frame is pressed or stamped from sheet metal to form a car-type semi- monocoque. The frame may be entirely pressed Ariel Arrowor may have just a pressed aft section connected to the steering head by a conventional steel tubular spine Honda Super Cub. Both the Super Cub and the Arrow also have pressed steel forks, instead of conventional telescopic forks.

More common in the car world, a monocoque frame comprises a structure where loads are supported through its external skin. On bikes they are used almost exclusively on racing motorcycles. If a "monocoque" frame uses additional support, such as tubes or longerons, the frame is more properly called a "semi-monocoque". An example is Peter Williams' semi-monocoque Norton racer. A trellis frame connects the steering head to the swingarm pivot as directly as possible using metal tube arranged in triangulated reinforcement.

Using lattice girder principles, a trellis frame is typically constructed of round or oval section metal tubular segments that are welded or brazed together. Although construction of a trellis frame needs a more complicated process than, say, an alloy beam frame, it requires only a simple jig and a competent welder. No heavy capital outlay is required, so a trellis frame is ideal for a model that may be made in relatively small numbers. For this reason, the trellis frame has found favour with European manufacturers, and Ducati in particular.

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Some motorcycles, such as the Yamaha TRXhave hybrid frames that employ alloy castings at the swingarm pivot area. Another variation is to suspend the engine from a trellis frame, but have the swingarm pivot cast into the rear of the engine. For rider comfort, a motorcycle's engine can be mounted on rubber bushings to isolate vibration from the rest of the machine. This strategy means the engine contributes little to frame stiffness, and absorbing rather than dissipating vibration can lead to stress damage to the frame, exhaust pipes, and other parts.

Instead, if the engine is rigidly mounted to the frame, vibrations pass to and are dissipated via the whole frame, and the rider. Rigid mounting allows the engine to contribute to the overall stiffness of the frame. It also becomes possible to mount the swingarm directly to the engine rather than the frame, avoiding the need for frame members extending downward to the swingarm pivot.

HAND-BUILT: Motorcycle Frames, Part 1 of 5

By increasing the number of mounting points between the engine and frame, vibrations and stress can be better dissipated in the frame, typically creating a triangle between the swingarm in the rear, the cylinder head at the top and the lower crankcase area at the front. If a rigidly mounted engine not only contributes to, but is critical to, the stiffness of the frame, and is an integral part of closing the triangle or trellis structure that transfers force from the headstock to the swingarm, to the point that without the engine the frame would be deformed, the engine is called a stressed memberor a lifted engine.

Sharing the load between the engine and frame reduces the overall weight of the motorcycle. Stressed member engines were pioneered at least as early as the Harley-Davidson 8-valve racer, and incorporated in the production Harley-Davidson Model W by During early testing of the Kawasaki GPZRtwin downtubes were included, creating a full cradle, but the downtubes were found to carry little load, so they were removed, relying entirely on the combination of the steel backbone and engine for chassis rigidity.

Frame stiffness is a problem for motorcycle designers, as it was for the bicycle frames that motorcycles are descendants of. Modifying the stiffness of a factory-produced frame can be undertaken to improve handling characteristics.Bicycles are divided into a seemingly endless number of categories and sub-categories.

The following list will help you understand all the various styles and features. Mountain Bike Mountain bikes have wide knobby tires which allow them to be ridden in loose dirt and over obstacles.

types of motorcycle frames pdf

These bikes have flat handlebars and rugged frames and components. Mountain bikes often have suspension to help any cyclist navigate rocky mountain trails. Many people ride mountain bikes on roads as well as trails. This does the bike no harm. It could be likened to one driving an SUV on the highway: the vehicle will operate fine—it is simply not the most efficient choice. While mountain-style bikes come in all price ranges, the lower end recreational versions are not suited for aggressive mountain biking but work great for trips on smooth dirt paths.

Traditionally, hybrids have a larger road bike sized wheel with a slightly thinner compared to the comfort bikes which yield smaller, mountain style wheels. Both bikes are loaded with comfort features and will work equally well on smooth dirt, paved trails, and family cycling trips.

These bikes have a very upright position meant for comfort. These bikes rule the road due to their extreme efficiency and speed. The larger thin tires help it glide along the road with little effort, while the multi-position handlebar offers grip variations from upright to more aggressive.

A road bike is a supreme choice for one intent to ride on pavement, especially for longer rides. It is our great fortune to live in an area with an abundance of great roads for cycling.

These machines have forward bull-horn shaped handlebars and aero bars. Aero bars allow the rider to lean forward in an aerodynamic position. The shifters on these bikes are located at the end of the aero bars. The geometry of the bicycle frame is designed to suit triathlon or time trial racing, both heavily focused on aerodynamics.

These bikes are often very robust and durable and would be the best selection for anyone intending to do jumps or tricks. Commuting Bike Simply put, a commuting bike is any bicycle used as general transportation, regardless of the style.A Human Spine consists of 26 bones and is divided into three sections. Each section and each bone playing a pivotal part in operations and movements. The core does that job. When you see different athletes from different sports, what remains common is a suitably strong core and a sorted spine.

But why are we discussing Biology? Well, just to give a resemblance that a Chassis or a Frame is a combination of both Core and Spine. Different vehicles, different purposes but what remains common is a suitably strong and sorted Frame. Today we keep our focus on Motorcycle Frames. Steel had been the most common choice for frame material but nowadays we also see materials such as Titanium, Magnesium, Aluminium and Carbon Fibre, depending on requirements and manufacturing costs.

Now we shall discuss the different types of Motorcycle Frames, which are:. As the name suggests, spine frames are frames in which a tube behaves as a spine of the bike by connecting the steering head tube and pivot point for the rear suspension, over which the engine and other components are mounted. It is seen in bikes like the Honda CB Before talking about single cradle frames, we need to understand what a cradle is.

It is a support for the engine that acts like a bed on which the engine is held and supported firmly. In single cradle frames, there are two tubes welded at the steering head tube.

First is the top tube which passes over the engine and the second tube, known as the bottom tube, passes beneath the engine and connects the top tube pivot point at the rear. This frame is most commonly found in commercial bikes due to its lower manufacturing cost and ease of maintenance. While the major disadvantage of this type of frame is under heavy braking and at a high lean angle, the forces generated at the steering head tube cannot be balanced. This results in the bike being wobbly and unstable.

Double cradle frames are a modified form of single cradle frames.

Free Motorcycle Identification Number (VIN) Decoder & Lookup

The difference is there are two bottom tubes passing beneath the engine supporting the engine. Double cradle frames are a bit heavier than single cradle frames but on the other hand these can easily handle forces generated while heavy braking and at high lean angles. The perimeter frame is also known as Twin-Spar Frame. The one characteristic that separates this design from the others is that the two box section tubes wrap around the engine to join the steering head tube and swing-arm pivot in the shortest distance possible which results in very less flex of frame so it gives more stability and behaves rigidly at high speeds, at high lean angles and under heavy braking.

Here, the engine is hung in the frame and there is no support beneath the engine and so the engine acts as a stressed member. Trellis frame and the perimeter frame are different interpretations of the same idea of frame design, which means trellis frame can be considered as the sub-type of perimeter frame. But unlike the box section used in perimeter frame, trellis frame uses twin tubes that connect the steering head tube to the swing-arm pivot. Stiffness and rigidity are added by reinforcing these frames by use of small circular tubes in triangulated form.

The major advantage is that its weight settings are lower than that of the perimeter frame. The front frame looks similar to that of the perimeter frame.

The advantage of this type of frame is as the engine acts as a part of the frame, less frame material is required and rigidity is improved but on the other hand, ride comfort is decreased. With this we conclude our article and hope we further increased the depth of your Automobile and Motorsports Vision. For the Car Lovers, we will return with four wheel chassis and frames.

Your email address will not be published. Skip to content. Now we shall discuss the different types of Motorcycle Frames, which are: Spine or Backbone Frame : As the name suggests, spine frames are frames in which a tube behaves as a spine of the bike by connecting the steering head tube and pivot point for the rear suspension, over which the engine and other components are mounted.

Spine Frame Single Cradle Frame : Before talking about single cradle frames, we need to understand what a cradle is.

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Perimeter Frame Aprilia RS V4 Trellis Frame : Trellis frame and the perimeter frame are different interpretations of the same idea of frame design, which means trellis frame can be considered as the sub-type of perimeter frame.Determine the year, make and model of most popular ATVs, motorcycles and Scooters.

Motorcycle VINs are usually stamped into the steering neck of the motorcycle. This is located just behind the front forks, behind the headlight if equipped. Many scooter VINs are stamped into the frame rails.

Often times you will have to remove scooter bodywork to locate the VIN. We have seen many scooters with VINs stamped into the left side frame rails and some with them stamped into the right side frame rails.

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Additionally, many scooters include an identification plate or sticker that will aid in scooter identification. Check the front and rear wheel wells along the right or left side. The letters I, i, O, o, Q, and q are never to be used so as to avoid confusion with numerals 1 and 0.

Character 1 The first character of the VIN tells us which region the motorcycle was manufactured in. Character 2 The second character, when combined with the first character denotes which country the motorcycle was manufactured in.

Character 3 The third character is used by powersports manfacturers to identify the vehicle type. It could be a motorcycle, ATV or scooter. Not every manufacturer uses the same codes. Characters 4 — 9 These characters are known as the Vehicle Descriptor Section. Characters 4 through 8 provide information about the model, engine size and body style options.

Character 9 is a check digit that is used to determine if the VIN is correct.

types of motorcycle frames pdf

Characters 10 — 17 These characters are known as the Vehicle Identifier Section. The 10th character indicates the marketing model year of the vehicle, not to be confused with the year of production. For example a Honda CBRRR most likely has a date of production in — it was produced for the marketing year. Characters 11 through 17 indicate the assembly facility, available options and the production number as it rolled off the assembly line.

I have a Suzuki cc quad and the previous owner does not know the year or model — all the stickers are missing too.

I used the Cyclepedia VIN decoder and was able to figure out the year and model — you guys are awesome! Now I can start ordering parts and get it going. You must be logged in to post a comment. Comments I have a Suzuki cc quad and the previous owner does not know the year or model — all the stickers are missing too.I always wondered why it was shaped that particular way and the engineering rationale behind it.

So after some research on motorcycle frame and chassis design, I learnt that there are actually only 4 frame types used on most production motorcycles. The cradle frame consists of a single top tube and a down tube two down tubes for a double cradle that runs from the steering head to underneath the engine. The tube loops round the engine, then goes back up to the swingarm pivot. A variation of the single cradle, known as the split single, has two small tubes at the bottom to support the engine and exhaust pipes.

Cradle frames are the simplest of all the frames and are strong and cheap to make and are usually found in off-road motorcycles. These series of triangles give the frame its strength and stiffness.

The advantage of the trellis frame is that it is lighter than the cradle due to the use of the engine performing structural duties. However, it is more expensive to manufacture than a cradle frame. The engine also needs to be reinforced as a result. The advantage of this frame type is that it is easily concealable, thus allowing for flexibility in the design of the bike. Notice the frame is not visible underneath the engine on the Triumph Thunderbird.

The beam or perimeter frame was made possible with advances in material technology. As aluminium alloy use became more widespread in frame materials, manufacturers exploited the stiffness of the material and created the beam frame. The engine then fits into the frame as a stressed member. Beam frames have the advantage of being very light and strong at the same time. While learning about the frames above, I found this patent filed by Ducati with the United States Patent Office which describes a bike without a traditional frame.

The steering head transitions into a box section that connects directly to the engine. At the rear, the configuration is similar, with the swingarm and seat also connecting directly to the engine. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account.

You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. Cradle The cradle frame consists of a single top tube and a down tube two down tubes for a double cradle that runs from the steering head to underneath the engine.

Single cradle frame. Double cradle frame. Close up of the triangles on a trellis frame. A trellis frame — light yet rigid. Ducati Street Fighter.

Spine frame.


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