![]() The most common way to adjust trail on a street bike is by adjusting ride height as road bikes have a limited amount of adjustable components with relation to geometry. The main areas used on the road and on circuit to adjust the trail of the front wheel are by adjusting either rake angle, offset or front tyre/wheel diameter. The increased stability is especially useful at high speeds where the rider needs to have full confidence in the bike. If you increase the amount of trail on the front wheels you will increase the stability of the bike but will require more effort to change direction. The trail is the main factor that determines how a bike steers and how stable the bike is on the road or circuit. Trail is the horizontal distance measured along the ground between the extrapolated line of the steering axis and the vertical front wheel centre line. The rake angle is one of the areas used to set trail and is governed by the frame steering axis mount and ride heights. Rake is the angle of the steering axis from a vertical centre line through the front wheel down to the contact patch. It is often set and governed by the fork triple clamp that mounts the forks a set distance away from the steering axis. The diagram below shows the offset distance of the front wheel geometry. Alternatively it is the distance from the steering stem to the fork centre line. Offset is the distance from the steering axis to the centre line of the front axle. There are 3 main areas of geometry for the front wheel. This section will cover front geometry and how to adjust it. The geometry categories are split into front geometry and rear geometry. However, the geometry that they do have is adjustable and affects the handling of the bike in a big way. Suspension Secrets Porsche GT Circuit Handling Pack Developmentĭue to motorbikes having 2 wheels instead of 4, they have significantly less geometry to think about.Suspension Secrets M3ATER Build – Part 2.Suspension Secrets M3ATER Build – Part 1.Porsche 930 Flatnose – Improving an Icon.Dallara World Series Single Seater – Under The Skin.Budget to Premium Coilovers – Whats The Real Difference?.2022 Porsche Cayman GT4 RS Suspension Overview.Calculating Ideal Spring and Roll Bar Rates Part 2.Calculating Ideal Spring and Roll Bar Rates.Tyre Performance and Grip – A Deeper Look.Tyre Failure – Graining, Tearing, Blistering and Wearing.Coilovers – Correct Ride Height Setting.The fundamental categories of suspension geometry are: Ackermann Bump Steer Camber Camber Gain Caster Front View Swing Arm Fundamentals of Grip Instantaneous Centre King Pin Inclination Scrub Radius Toe Tyre Slip Angle There are more aspects to suspension geometry but the most influential are listed above and are the focus of this website. Geometry Suspension geometry is a mixture of theoretical lines designed into a suspension system to make it work in a particular designed way.
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