Air suspension design book, vol 1 link based rear suspension. By jason mitchell on december 3, 2008 43 comments over the past 5 years, mountain bike suspension designs have evolved from a few designs essentially horst and singlepivot to a myriad of highperformance suspension designs vpp, dwlink, cva, maestro, abp, idrive, ict, ets and the like. With kickass lowerlink vpp suspension, a streamlined design, the typical santa cruz refinement, and rather radical geometry, the tallboy is back to being a genre bending folk hero. In the horse and buggy days, the suspension system consisted merely of a beam axle that extended across the width of the vehicle. Design and manufacture of an adaptive suspension system. Amir khajepour the purpose of this book is to cover essential aspects of vehicle suspension systems and provide an easy approach for their analysis and design. It doesnt require novelty shocks and hardware that offers dubious longterm support.
The santa cruz tallboy uses the same vpp suspension design that you find on the blur, nomad and their signature dh bikethe v10. This results in a progressive suspension design, providing different levels of stiffness throughout the stages of its travel. I want any good book, but one specifically about long travel off road would be great. A basic primer on mountain bike suspension designs. The disadvantage of a single pivot design is a linear leverage ratio, meaning that if x amount of pressure results in y amount of suspension compression, 2x will result in 2y. The beauty of vpp suspension is that it requires no links in the rear triangle.
Bicycle suspension is the system, or systems, used to suspend the rider and bicycle in order to insulate them from the roughness of the terrain. Explaining how the most popular designs work, plus their potential advantages. Bicycle suspension is the system, or systems, used to suspend the rider and bicycle in order to. On this web page youll find offroad suspension design. Chassis engineering explains the complex principles of suspension geometry and chassis design in terms the novice can easily understand and apply to any project. The trails that i was about to ride i knew very well and had spent many hours building and riding them. Vpp actually raises and extends the suspension when standing and pedaling in the small and middle rings, and has a pedaling cadence stalling effect when pedaling in larger bumps. I have written many advanced technical articles for a myriad of the most respected truck magazines, from sport truck to streettrucks to minitruckin. Chassis engineering is a great introduction to race car design. Keeping your suspension links and pivots clean and lubed is a great way to maximize the benefits of your bikes suspension design, and bearing longevity.
Design of three and four link suspensions for off road use. Santa cruzs vpp is a fourbar design that features links that turn in opposite directions. Vpp is designed to work with the best available technology from suspension manufacturers that will be supported longterm. Do you know why a single pivot bike rides differently to a fourbar design, or why a vpp link climbs so well.
Basic designs we covered some basic concepts and definitions in our first suspension 101 article, so you should now know the difference between a full suspension and a hardtail, and you should have a pretty good sense of the amount of travel you want in your bike. The book also includes a unique stringbased model approach to handson visualization of suspension. Featuring the patented vpp suspension design, the spider xvp has been reffered to by many as the best cross country specific bike. The new vpp 3 doesnt do this nearly as much and i was impressed with its overall feel aboard the hightower and the tallboy. I have written many advanced technical articles for a myriad of the most respected truck magazines, from. Now regarding the platform of a bike santa cruz vpp suspension is probably in my opinion the best suspension platform that i have ridden that is until. This book consists in a definition and analysis of baja suspension geometry to an offroad vehicle. Suspension design is a very complex topic, and theres a huge variation in. The resulting suspension performance allows you to push harder and charge towards things you used to think were a big deal. Bicycle suspension is used primarily on mountain bikes, but is also common on hybrid bicycles. Virtual pivot point technology has put into the hands of engineers endless possibilities to manipulate the wheel path of rear suspension. Mar 19, 2019 the santa cruz megatower is driven by 160mm of vpp suspension that plays nice with air or coil shocks. Virtual pivot point vpp suspension design analysed and explained. Which is the best rear suspension system in the market.
Virtual pivot point vpp suspension design juliana bicycles. Instant center virtual pivot mtb rear suspension ep. The virtual pivot point migrates forward as the suspension. What are your recommendations for the best suspension platform. On top of the book, we have started a youtube channel that will be dedicated to general automotive and suspension subjects. How your bikes suspension design affects its performance.
I am looking for suspension design books that get into proper design for roll center, tire scrub, bump steer, etc. What are your recommendations for the best suspension. Some, such as santa cruzs vpp system, use links that counterrotate turn in. Try out these fantastic titles without spending a dime. This is the patented suspension technology that all santa cruz mountain bikes use. Best car chassis, suspension, aerodynamics design books.
The key to vpp is the 2 short links that move in opposite rotational directions. A beginners guide to mountain bike suspension design. Suspension geometry is the foundation of vehicle performance from which highconfidence suspension components and tunings can be. Ride and handling of baja buggies book, and all of them are completely totally free. Ill tell you why my name is max fish, i have owned and operated bio kustums since 1997 where we specialize in suspension design, engineering and fabrication. Suspension system design excellence follows the basic laws of physics using design synthesis techniques, a methodical process for suspension geometry development. Vehicle suspension system technology and design ebook. In this video i look at the antirise, antisquat, leverage ratio, spring rate, wheel rate, and wheel path of the popular virtual pivot point vpp suspension as used on the 2020 santa cruz megatower mountain bike. A suspension design can use chain tension to overcome pedalinduced suspension bob, but still be fully active when pedalling over bumps. Both fourbar and vpp sdl systems have an instant centre and the difference between these two systems is how much and how rapidly the instant centre migrates through the suspension travel. Fullsuspension wheelworks bicycle stores and cycling centers. The tallboy uses santa cruzs virtual pivot point vpp suspension design, featuring short, stout suspension links that rotate in opposite directions as the bike moves through its travel. For a fourbar design the rotating lengths of the quadrilateral are relatively long, whereas a vpp sdl, the rotating lengths are relatively short. Ride and handling of baja buggies book, and all of.
Sure, 10mm more travel might only seem like one small stepbut coupled with a lower linkdriven vpp suspension design, this is one giant leap for the tallboy. Illustrated guide to mountain bike suspension designs bike bros. The virtual pivot point or vpp, is the name given to a fourbar linkage. The suspension selection is accomplished through the study of its geometric characteristics to design its dimensions and position of installation in the vehicle according to the expected behavior. Its amazing how the vpp suspension design can transition from stable platform to super plush, and the carbine 275 seems to deliver in this aspect better than any other santa cruz or intense bike ive ridden.
When you put hardearned energy into your pedals, you want as much of it as possible to generate forward momentumany uppydowny movement of the suspension is a waste of valuable effort. The ultimate guide to mountain bike rear suspension systems explaining how the most popular designs work, plus their potential advantages or shortcomings share on facebook. Similar to the dw link, except that the two links connecting the front and rear triangles move in opposite. The book is structured in an easy and logical way that identifies the best steering and suspension designs. Air suspension design book, focusing on suspension theory and shockairbag theory, geared towards the doityourselfer. Therefore, as a designer you will need to work from some parallel sources. The single pivot will bob on the climbs if its not locked out, but it is way better descending straight down. The ultimate guide to mountain bike rear suspension systems. The virtual pivot point or vpp and the dwlink are variations on the four bar, and both fully independent systems use twin links to isolate the rear end. Explaining how the most popular designs work, plus their potential. One of the design aspects of suspension is being able to manipulate the measurable resistance at the rear wheel spring constant of the system.
I used to despise the vpp design as it hung up terribly due to its excessive antisquat and resultant pedalfeedback. Sign up for our newsletter to keep up to date on the progress. What was being sold as vpp had nothing to do with the supposed s path suspension. To our knowledge there is no specific book covering the design and construction of these scratchbuilt offroad racing machines. Popular examples giants maestro suspension, ibis dwlink suspension, santa cruzs vpp. The vpp is very good on open or trail mode and you dont need to bother with it when climbing or descending. Design and manufacture of an adaptive suspension system a major qualifying project report submitted to the faculty of worcester polytechnic institute this report represents the work of wpi undergraduate students submitted to the faculty as evidence of completion of a degree requirement. There is no such pedal stalling or suspension extending effects from the dw. The vpp is designed to improve the pedalling performance of rear suspension, while retaining the ability to actively absorb bumps. This system is used for its superior ability to articulate without having components bind, and its relative ease of design and manufacture. Suspension geometry is the foundation of vehicle performance from which highconfidence suspension components and tunings can be developed. Explanation of the instant center virtual pivot for the rear wheel and rear brake for some types of suspension linkages.
Virtual pivot point vpp suspension design analysed and. I have heard of one called racing by the numbers, but i cant find it anywhere. Make sure to subscribe to our channel to be updated with future videos. A full analysis to explain how the vpp suspension of the 2020 santa cruz. What sc and intense do have is a fairly flat and high amount of antisquat, which has increased over the years to around 100% and exists to at least half of the travel, in the case of most intense bikes, up to 23rds, with a few going even further. In a practical and downtoearth way, it covers the fundamentals of how race cars handle and the requirements for designing and constructing a car.
Contact our friendly staff today and well be happy to help you get the parts you need no matter what youre working on. The book includes chapters on chassis design, suspension design, frame construction, aerodynamics and tuning. Servicing vpp suspension bike links gehrig wants to know can you show me how to service the suspension links and pivots on my new santa cruz. Air suspension design book, vol 1 link based rear suspension paperback. Suspension systems explained mountain biking australia. Is it true that fsr is better for downhill and vpp better for pedalling. Pedantic publishing air suspension design books at. This book covers everything you need to know about designing and building your new chassis and suspension system, exploring both factory and aftermarket frames, modified factory solidaxle suspensions, and independent suspension setups. I am caught between most suspension and design books being far too basic and not all that helpful to the other extreme, like this book, being too engineering theory based. How your bikes suspension design affects its performance on the trail.
Understanding mtb suspension a comprehensive guide to. In designs like the dwlink used by ibis, the rocker links rotate in the same direction while brands like santa cruz use variations of the vpp. Virtual pivot point vpp suspension design analysed and explained mechanical in this video i look at the antirise, antisquat, leverage ratio, spring rate, wheel rate, and wheel path of the popular virtual pivot point vpp suspension as used on the 2020 santa cruz megatower mountain bike. With kickass lowerlink vpp suspension, a streamlined design, the typical santa cruz refinement, and rather radical geometry, the tallboy is back to being a genrebending folk hero. May 09, 2016 suspension design the bronson uses the third iteration of santa cruzs virtual pivot point vpp suspension design for its 150mm of travel, with the lower link now tucked up closer into the frame. While santa cruz holds steady to their dedication to single pivot swingarm design on their full suspension mountain bikes, their calling card is their virtual pivot point vpp suspension design. Is the horstlink suspension design becoming irrelevant. The advance design era 19471955 has been overlooked for long enough and deve krehbiel, a wellknown restoration expert from who specializes in these trucks, puts his 40 years of experience restoring nothing but advance design trucks into a very extensive and very complete single volume with more than 500 photos and detailed instruction for every aspect of a proper restoration. The lockout on a vpp design is caused by the two bars rotating against each other in turn caused by. Radically redesigned into a lowerlink mounted shock configuration, the roubion has taken notes from the stregas spellbook. This multilink design uses two small links at the bottom bracket and seat tube to create a wide variety of suspension rates for varying needs.
Yes rough terrain the suspension stiffens up but that depends on the bike. Description from the make of the top downhill race bicycles in the world, comes revolutionary spider xvp. As mentioned on the design page, the most optimal path is the sshaped curve. Synthesis lectures on advances in automotive technology. Mountain bike rear suspension may appear to come in a baffling array of.
The author explains the history of suspension design and types, handling theory, suspension design techniques, and the mathcalculations used in design. The new 120mm tallboy takes a leap further into what shorttravel bikes really are capable of. Vpp uses two short links rotating in opposite directions, one below the. The last option, and most commonly used, is a link controlled beam axle suspension design such as the one shown in figure 1 typical rock crawling obstacle. Air suspension design book spreading airbag suspension. Air sprung designs have various ways of dealing with preload. A water bottle and coil shock can be tucked inside the main triangle. A full suspension mountain bike, in this case, an older trek fuel with a linkage driven single pivot design. This is done through changing the angle at which force is applied to the shock by some linkage.
Suspension systems explained mountain biking australia magazine. Rather than contracting a series of kooky inventors to try build ever more complex and wackadoo suspension designs or proprietary shocks so the marketing department has something to talk about, weve stuck with what is an extremely versatile and highperformance mechanism. The ultimate guide to mountain bike rear suspension. I used to despise the vpp design as it hung up terribly due to its excessive antisquat and. None less than sanatcruz who claimed their vpp variable pivot point system. So who the hell is this max guy and why should i care if he writes a book.
The ultra efficient vpp suspension design, complemented by a dual remote lockout and super stiff carbon frame, means youve got more thrust on demand than spacex. Rather than contracting a series of kooky inventors to try to build ever more complex and wackadoo suspension designs or proprietary shocks so the marketing department has something to talk about, weve stuck with what is an extremely versatile and highperformance mechanism. I will provide some overall musings on suspension design. The book competition car suspension is an excellent, well written manual that describes the design evolution of vehicle suspension and steering systems. The ratio between the rear axle point a and the shockmounting eye point c is called the leverage. The virtual pivot point or vpp, is the name given to a fourbar linkage suspension.
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