RAKE ANGLE OF MOTORCYCLE

WHAT IS RAKE ANGLE?

Rake angle is the angle between the steering axis and the vertical imaginary line passing through front wheel's centre.(as shown in figure ).


Steering axis is the angle on which the front wheel geometry (front forks assembly, handlebars, triple clamps, front wheel) swivels.

Note: Rake angle is also called "Caster angle" or simply "Rake".

EFFECT OF RAKE ON THE -

  • Steering Effort : The motorcycle with less rake angle will be having quicker steering, hence less steering effort is required to turn the handlebars in either direction. For more rake motorcycles the steering is slower (as compared to less rake angle motorcycle) i.e. one will have to apply a greater effort to turn the handlebar.

  • Stability : For the motorcycles with less rake, less steering effort is required therefore the stability of the motorcycle in straight line is lower as compared to the motorcycles with higher rake angle.

  • Trail : Trail is the distance between the front wheel contact patch and the steering axis extension to ground . The trail of the motorcycle is much important for deciding the stability. Higher rake means large trail and the higher stability, lower trail means small trail and low stability as large trail means high self centering effect of the front wheel.

  • Wheelbase : Wheelbase is the distance between the front and back tyre contact patch on ground. If we increase the rake angle of motorcycle the wheelbase will also get increased. Higher wheelbase means higher stability and vice versa.
For racing bikes, the rake (caster) angle is somewhere between 20 to 25 in degrees.

For sports bikes, the rake is somewhere between 23 to 26 degrees.

For cruisers or touring bikes, the rake is between 25 to 30 degrees.

To initiate a quicker turn to avoid sudden obstacle in between riding in a straight line, sports and racing bikes are good in this respect.

High rake angle also means lower seat height as in cruiser bikes.


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