![]() Take a moment to think about what it was like learning to ride a bike: the thing had this horrible tendency to swerve, and quelling it seemed to be the secret to remaining upright. The geometry of any bike comprises a variety of measures and angles, but it is those that are important to steering that dictate how it will handle. There appears to be a hierarchy of sorts, because some parameters have a bigger impact than others, but in every instance, these effects can be traced back to one single mechanism, and that is the steering of the bike. While our understanding is not yet complete, all of this work has identified a core set of parameters that dictate the behaviour of a bike. Academics have dissected the dynamics of motion and defined the minimum requirements for a self-stable bike while the bike industry has experimented with various designs to define what works and what doesn’t work for every riding discipline. #Steering geometry calculator how to#Two centuries of experience has taught us a lot about the way that a bike behaves and how to make it easier to control. If nothing else, when a bike is easy to control, it will elevate the rider’s enjoyment of the sport. It’s an issue that is important to the safety of a rider as well as their confidence, and in some instances, it can assist their performance, too. That’s because they influence the way that the bike handles, be it on the ground, in a corner, up a hill, or even in the air. There are other aspects to frame geometry, such as the head tube angle or the amount of trail, which have no bearing on the fit of the bike, yet they can still have an effect on the rider. This is something that we have discussed previously in our article on sizing up a road bike where we identified those aspects of frame geometry that are important to fit. When it comes to buying a new bike, most riders understand the importance of finding the right size frame. This is something that we started to decipher with our original article on the topic in 2011, and now, Matt Wikstrom revisits it to delve even deeper into the parameters that influence the handling of a bike. Head angle, fork rake, trail, and wheel flop: these are just some of the parameters that influence the steering and handling of a bike, however in the absence of any context, they often appear as a set of meaningless numbers in a frame geometry chart. Now there are dozens of specialised bikes on the market and the distinctions that separate them are often related to the way that they perform and behave, which in turn, is dictated by the geometry of the frame and fork. 12.Over the last 200 years, the design of the bicycle has evolved in a variety of ways to meet the needs of a diverse range of riding disciplines. (R 2 + N 2) * cos 2Beta - 2 * R * B * cos Beta + B 2 - N 2 = 0 Into the equation for fork offset B yields the following quadratic: The smaller the fork offset (the straighter the fork) the longer the trail - contrary to a wide-spread conviction.Ī few examples measured at my own bicycles: Negative values: hub follows the steering axis (fork "bent backward"). Positive values: hub preceeds the steering axis (as shown in the image). Here defined as the angle between the floor behind the front wheel and the steering axis (see image above).ĭistance between the contact point (center of the contact patch) of the front wheel on the floor and the point where the "virtually" elongated steering axis meets the ground. TopOfPage | SteeringGeometr圜alculator | WheelDiameterTable | Text | Formulae Trail passes zero (turns to negative values) if the steering is turned by The comma as well as the point may be used as decimal point.įurther results from the above steering geometry data: The input field of the variable to be calculated must be empty. Your browser doesn't support JavaScript, or JavaScript has been disabled. Geometrical Relation between Head Tube Angle, Trail and Fork Offset ![]()
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