Lean angle

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Motorcycle cornering
Lean angle training

The lean angle in two-wheelers describes the area of ​​possible lean angle before a component touches down. The design of the two-wheeler and the cornering force of the tires limit the lean angle.

motorcycle

In the 1980s, the Fédération Internationale de Motocyclisme prescribed a lean angle of 50 ° for racing motorcycles in the compressed state. As a result of the further development, especially in the area of ​​tires with regard to the grip limit , the freedom from lean angles is not restricted by components (e.g. exhaust system, footrests ) not only in racing but also in sporty motorcycles. In racing, the lean angle is achieved in particular by raising the rear of the vehicle.

The cornering force of the tires usually determines the lean angle. Series tires can reach an incline of up to 55 ° on dry, adhesive road surfaces , racing tires, etc. a. in MotoGP , allow lean angles of over 62 °. In the case of choppers and cruisers , however, due to the design (as deep and wide seating position as possible), the freedom of inclination can be limited, which is in the range of 30 °. Bernt Spiegel describes a “programmed” inclination of the human being that [as an inherited repertoire] “only extends up to about 20 degrees”. In normal road traffic, the inclined position is between 20 and 30 °. During driver safety training , this range can be safely exceeded during banking training .

bicycle

With a bicycle , the freedom of lean angle is determined by the geometry of the frame, the length of the pedal cranks and the width and structure of the pedals. For criteria races in which many curves are driven, there are special frames with a higher-lying bottom bracket. In addition, cranks with a length of 165 mm are mounted (otherwise 170 to 177.5 mm). If there is insufficient lean angle, the racing driver has to stop pedaling in the curve. The adhesion limit of the tires plays a major role on bicycles on wet surfaces, dirty asphalt and cobblestones. Bicycle tires make large lean angles (≥ 35 °) impossible, even with an optimal road surface in connection with the lower static friction (compared to motorcycle tires). Racing tires (23 to 25 mm) with special compounds can, however, allow large lean angles of up to 50 °.

literature

  • Rüdiger Bellersheim among others: specialist knowledge of motorcycle technology . 2nd Edition. Europe-Lehrmittel Haan-Gruiten, 2013, ISBN 978-3-8085-2232-5
  • Helmut Werner Bönsch: Introduction to motorcycle technology. 3. Edition. Motorbuch-Verlag Stuttgart 1981, ISBN 3-87943-571-5 .
  • Jürgen Stoffregen: Motorcycle technology - basics and concepts of engine, drive and chassis. 8th edition. Vieweg Verlag, Braunschweig 2012, ISBN 978-3-8348-1716-7

Web links

Individual evidence

  1. ↑ Rüdiger Bellersheim include: expertise motorcycles . P. 183.
  2. ^ Helmut Werner Bönsch: Introduction to motorcycle technology. P. 276.
  3. ↑ Jürgen Stoffregen: Motorcycle technology. P. 194.
  4. ↑ Jürgen Stoffregen: Motorcycle technology. P. 439.
  5. ↑ PS 02/2016, p. 46.
  6. ↑ See Harley-Davidson Dyna Fat Bob: 30 ° right, 31 ° left [1]
  7. ↑ Bernt Spiegel : The upper half of the motorcycle. 10th edition. Motorbuch Verlag, Stuttgart 2012, ISBN 978-3-613-03386-3 , p. 43.
  8. ↑ Tour 2/2007: tire test , pp. 70–73. [2]