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Books Download Race Tech s Motorcycle Suspension Bible [PDF] by Paul Thede Read Full Online "Click Visit button" to access full FREE ebook. Motorcycle Suspension Bible By Paul Thede Jun 19 [PDF] [EPUB] -. RACE TECHS MOTORCYCLE SUSPENSION BIBLE BY PAUL. RACH TECH'S MOTORCYCLE SUSPENSION BIBLE. Based on Paul Thede's wildly popular Race Tech Suspension Seminars taught around the world, this.

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Motorcycle Suspension Bible. • Suspension Tuning, Repair, and Maintenance. • Designing Custom Suspension Systems. • Modifying and Upgrading Stock. Race Tech's Motorcycle Suspension - Ebook download as PDF File . pdf) or read book online. Editorial Reviews. Review. “Race Tech's Motorcycle Suspension Bible provides a clear understanding of the most misunderstood aspect of motorcycle.

Front suspension[ edit ] The most common form of front suspension for a modern motorcycle is the telescopic fork. Other fork designs are girder forks, suspended on sprung parallel links not common since the s and bottom leading link designs, not common since the s. Vincent Black Lightning with Girdraulic front suspension Some manufacturers e. Greeves used a version of the swinging arm for front suspension on their motocross designs. A single-sided version of the idea is also used in motor scooters such as the Vespa. The Hub-center steering as developed by Ascanio Rodorigo , on a concept associated to Massimo Tamburini is a complex front swingarm alternative system that entails suspension and steering, as seen in projects such as Bimota Tesi and Vyrus motorcycles. Main article: Motorcycle fork Scott produced a motorcycle with telescopic forks in , [2] [3] and would continue to use them until

As you increase the movement of the suspension, the greater the resistance that the shock absorber provides. This allows shock absorbers to seamlessly adjust to prevailing road conditions and help control any and all of the unnecessary and unwanted motions that can transpire in a moving car.

This can include sway, acceleration squat, bounce, and brake dive. Suspension struts There is another dampening mechanism that typically works like a shock absorber. This is the suspension strut or simply strut. A suspension strut is actually a shock absorber that is already mounted inside a coil spring, essentially two suspension components in one.

Anti-sway bars While not necessarily an integral part of a vehicle suspension system, anti-sway bars or anti-roll bars can, nevertheless provide additional stability for any moving vehicle. Anti-sway bars are metal rods that join the opposing suspension systems on the same axle and are often used in tandem with suspension struts or shock absorbers.

When there is movement in the suspension of one wheel, this movement is transferred by the anti-sway bar to the other wheel to create a more even or more level ride. This also helps reduce the swaying tendency of the vehicle especially when turning. Types of Suspension Cars typically have different suspension systems for the front and rear axles with each axle providing mounting for two wheels on opposite ends.

The type of suspension on any given car is thus determined by the arrangement of the axle; whether it allows for the independent movement of the individual wheels or binds the wheels to the axle. Dependent front suspension We have already described this in our discussion on how suspension systems work. To review, just imagine a rigid bar that connects to the front wheels and typically supported by shock absorbers and leaf springs. There are 3 reasons why some people hate this kind of arrangement.

Second, it increases unsprung weight.

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Third, it is difficult to adjust the wheel alignment because of the rigid axle. Independent front suspension As you may have already guessed, this type of front suspension allows the wheels to move independent of each other, except when they are joined by an anti-sway bar.

There are several subtypes of this car suspension system. These include the following. MacPherson suspension strut This is the most widely used front suspension system today, but most especially by European brands. It is best described as a shock absorber built inside a coil spring to function as a single cohesive unit.

It is more specific for front wheel drive cars. Double wishbone This is also known as A-arm suspension because of its unique A-shaped design. The system also features a coil spring and shock absorber. These are typically used in larger cars and sedans because of the way they help minimize sway while allowing for greater consistency in the steering feel.

There are several types of double wishbone configurations. We already described the Coil Spring Type 1 design above. The Coil Spring Type 2 differs in the placement of the coil spring and shock absorber combination.

Instead of this located between the two A-arms, it is positioned just above the upper A-arm. It really is not a very popular configuration since shock and spring combination essentially eats up precious vertical space. The latest double wishbone configuration, typically seen in the A4 and A8 of Audi, is the multi-link suspension. The only difference here is in the way the A-arm is broken down into component sub-arms, generally featuring complex pivot systems.

Many say this allows for better road-holding abilities because the multiple joints can be adjusted in infinite configurations for best riding comfort. Trailing arm suspension You can think of this as something similar to a double wishbone except that you have especially shaped suspension arms that are connected to the chassis.

These arms move parallel to the chassis. And you can perhaps appreciate this more on a VW Beetle. Twin I-beam suspension This front suspension system is seen almost exclusively on the F-series trucks of Ford. It combines solid beam axle with trailing arm suspension. The beam axle is split in two, eliminating the issues seen in dependent front suspension systems. If not, then a mountain bike or racing bike with rubber suspension systems will give you an idea of how the system operates.

Basically, the Moulton design replaces the coil spring and shock absorber configuration with a solid mass of rubber. Transverse leaf spring suspension Most car enthusiasts find this system odd since it integrates leaf spring with independent double wishbone mechanism instead of the usual coil spring. A leaf spring is positioned across the entire width of the vehicle and connected to the lower A-arms of the double wishbone on both sides.

The center of the leaf spring is mounted to the subframe of the vehicle. As such, it is quite common to see many cars use dependent systems for the rear axle.

Here are some of them. Solid axle This has got to be one of the simplest and easiest to set up. You have either leaf spring or coil spring mounted on both ends of the drive axle. It may not look elegant but it sure is simple and cheap. If a coil spring is used instead of the leaf spring, control arms are required to provide lateral support. Beam axle This type of dependent rear suspension is generally found in cars with front wheel drive systems since the drive axle is located up front.

One of the distinguishing features of the beam axle rear suspension is the presence of a panhard rod or track bar. This is a piece of metal that runs diagonally from one end of the beam to a point in the opposite spring mount or opposite control arm.

It comes in triangulated and parallel configurations. It is the favorite system used by street rodders and even those that ride classic hot rods. De Dion suspension This is a rather odd combination of a trailing arm fully independent suspension and a solid beam live axle suspension. While it is weird, it does offer a few advantages such as greater traction and reduced unsprung weight.

Unfortunately, it is also weighed down by a host of disadvantages like requiring two CV joints for each axle which adds weight and complexity. The brakes are also mounted inboard which requires the dismantling of the entire suspension system should you decide to change your brake disc.

Independent rear suspension The same independent front suspension systems can also be used in the rear to provide for a vehicle that truly deserves the badge of having 4-wheel independent suspension.

The thing is that the overall cost will depend on the extent of the damage or the kind of repair that needs to be performed, the make and model of your car, and your very own DIY repair capabilities. Suspension struts, springs, and shocks are typically engineered to last long. Under normal driving conditions with very minimal potholes, bumps, and other road surface problems, struts and shocks can actually last up to 10 years.

Generally, most car manufacturers recommend changing the shock absorber every 40, or 50, miles. However, a better recommendation is to have the suspension system inspected at 40, miles and then annually thereafter.

Using extreme care, clean the exposed contact points, then refit everything.

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This should extinguish the warning lamp. Similarly, the rear brake pads were almost worn to the limit and the pollen filter looked as though it had never been changed. We also found a few more jobs for the future. There are signs of coolant around the bottom corners of the radiator, traces of oil around the bottom intercooler pipe, a possible oil leak from the Garrett turbo and the outer CV boot for the nearside front driveshaft is split.

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Other springs require greater force to lift and allow flow. This gives the fork digressive damping, allowing it to be stiff over small bumps, yet relatively softer over larger bumps. Also, the springs or shims only allow flow in one direction, so one set of springs controls compression damping, and another rebound damping. This allows the dampings to be set separately.

Cartridge emulators are aftermarket parts that make damper-rod forks behave virtually as cartridge forks. The emulator has a very small orifice for low fork-speed damping, and an adjustable shim-stack for high fork-speed damping. Gas-charged cartridge forks, which became available in ,[ citation needed ] consist of gas-charged cartridges fitted within standard forks.

This kit is suitable for supersport classes of racing, where regulations prohibit a complete fork replacement but allow modification of the original forks. Brake dive[ edit ] Applying the brakes of a moving motorcycle increases the load borne by the front wheel and decrease the load borne by the rear wheel due to a phenomenon called load transfer.

For a detailed explanation and a sample calculation, see the braking section of the Bicycle and motorcycle dynamics article. BMW's Earles fork eliminated and reversed brake dive If the motorcycle is equipped with telescopic forks , the added load on the front wheel is transmitted through the forks, which compress.

This shortening of the forks causes the front end of the bike to move lower, and this is called brake dive. Telescopic forks are particularly prone to this, unlike leading link designs. Brake dive can be disconcerting to the rider, who may feel like he or she is about to be thrown over the front of the motorcycle.

If the bike dives so far as to bottom out the front forks, it can also cause handling and braking problems. One of the purposes of a suspension is to help maintain contact between the tire and road.

If the suspension has bottomed out, it is no longer moving as it should, and is no longer helping to maintain contact. While excessive brake dive is disconcerting, and bottoming out can cause loss of traction, a certain amount of brake dive reduces the rake and trail of the motorcycle, allowing it to turn more easily.

This is especially important to racers trail braking on entrance to corners. Brake dive with telescopic forks can be reduced by either increasing the spring rate of the fork springs, or increasing the compression damping of the forks.

However, all of these changes make the motorcycle less pleasant to ride on rough roads, since the front end will feel stiffer, in the s various manufacturers attempted to get round this by methods of anti-dive such as: Honda TRAC ACT: Developed by Marzocchi and fitted to Buell motorcycles such as the Buell RR The PDF units works in a similar way, except that they rely entirely on the compression stroke itself.

The valves are spring-loaded so if the wheel hits a bump, they bounce off their seats and restore the flow of oil for a moment to allow the suspension to absorb the shock.

With the advent of cartridge forks, which allow more low speed damping and less high speed damping than the previous damping rod forks, separate anti-dive mechanisms have generally fallen out of use. Another method to reduce or eliminate brake dive in telescopic forks is to use a reactive link or torque arm to connect the braking components to the motorcycle frame via the triple clamp. Some fork designs mitigate dive, eliminate it, or even reverse it without affecting the front suspension adversely.

The Earles fork is among the latter; when braking the front brake hard, the front end of the motorcycle actually rises. BMW's Telelever fork is designed to nearly eliminate dive, and could have been designed to eliminate it completely if the manufacturer chose to do so.

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Leading link front forks, such as used on some Ural motorcycles , can also be designed either to reduce or eliminate dive.

This causes the rake and trail to increase during braking instead of decreasing as with traditional telescopic forks. Hossack himself described the system as a 'steered upright'. Single-sided[ edit ] A single-sided front swingarm suspension was used on the Yamaha GTS , introduced in A single sided girder fork was use on the German Imme R motorcycle between and , [9] and the Vespa scooter has a single-sided trailing-link fork.

More recently, between and , the ItalJet " Dragster " scooter also used a single-sided swingarm suspension, though unlike the GTS there was no upper control arm; the upper part of the suspension on the Dragster served only to transmit steering input.

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The advantages of using a hub-center steering system instead of a more conventional motorcycle fork are that hub-center steering separates the steering, braking, and suspension functions. With a fork the braking forces are put through the suspension, a situation that leads to the suspension being compressed, using up a large amount of suspension travel which makes dealing with bumps and other road irregularities extremely difficult.

As the forks dive the steering geometry of the bike also changes making the bike more nervous, and inversely on acceleration becomes more lazy.