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Further refinements can be made to the weight data to improve this relationship. The weight and suspension data show some distinct similarities, even though the weight calculations were made using broad approximations. The same front and rear weight data from the previous chart is shown, this time along with front (blue) and rear (green) suspension data. If this approximation is used, the equations for front and rear weight become:įront_Weight = Total_Weight *.

Note also that he sum of front and rear weight must always equal total weight.Īs mentioned previously, the CG on most sportbikes is located midway between the axles and at a height equal to one half the wheelbase. A higher center of gravity will cause more weight to transfer under acceleration and braking. Note that the first portion of each equation represents the static distribution of the total weight determined by the horizontal position of the center of gravity, while the second portion represents the weight transfer due to acceleration or braking and is dependent on the height of the center of gravity. Note that in some braking areas that rear weight goes negative, indicating the rear wheel may be off the ground. This chart shows data for speed (black), total weight (red), front weight (blue) and rear weight (green). X=horizontal position of CG from front axle

Using GPS longitudinal acceleration data, approximations can be found that show how the total weight is distributed when the motorcycle is accelerating or braking on level ground. The amount of weight on each wheel depends on a number of factors. Note that the acceleration and braking forces act on what we have designated the total weight of the bike and rider, which includes cornering forces. As the motorcycle accelerates, weight is transferred from the front wheel to the rear wheel under braking, weight transfers from the rear wheel to the front wheel.

Now that we have looked at static weight distribution and also found how cornering forces add to the total weight of the motorcycle and rider, in this post we will show how total weight is distributed between the front and rear wheels. An approximation for front and rear dynamic weight can be determined from longitudinal acceleration and values for the wheelbase and center of gravity position.