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The force in the spring is (roughly) the vertical force at the contact patch divided by the motion ratio, and the spring rate is the wheel rate divided by the motion ratio squared. I R = S p r i n g D i s p l a c e m e n t W h e e l D i s p l a c e m e n t . {\displaystyle IR={\frac {SpringDisplacement}{WheelDisplacement}}.}
The combined center of mass of a typical upright bicycle and rider will be about 60 cm (24 in) back from the front wheel contact patch and 120 cm (47 in) above, allowing a maximum deceleration of 0.5 g (5 m/s 2 or 16 ft/s 2). [28] If the rider modulates the brakes properly, however, pitching can be avoided.
Rider weight shift due to their pedaling stroke; The chain tension acting on the suspension; The suspension squatting or jacking due to acceleration forces. On bikes which are subject to bob, the following two techniques can reduce it. Increase the compression damping of the suspension; Increase the spring rate of the suspension
Vehicle dynamics is the study of vehicle motion, e.g., how a vehicle's forward movement changes in response to driver inputs, propulsion system outputs, ambient conditions, air/surface/water conditions, etc. Vehicle dynamics is a part of engineering primarily based on classical mechanics.
E.g., a reduction of 10% of the total system weight (bicycle, rider, and luggage combined) will save nearly 10% power. A reduced mass is also directly felt when accelerating. For example, the Analytic Cycling calculator Archived 2022-01-15 at the Wayback Machine gives a time/distance advantage of 0.16 s/188 cm for a sprinter with 500 g lighter ...
Swing arm extended to help alleviate the "bucking" of the previous models. The "bucking" should be able to be tuned out with the correct (for the riders weight) spring. And by tuning the compression / rebound. Rider position is lowered by 8 mm; Rear suspension travel is extended from 9 inches (230 mm) to 9.3 inches (240 mm)
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Pre-load is used to adjust the initial position of the suspension with the weight of the motorcycle and rider acting on it. The difference between the fully extended length of the suspension and the length compressed by the weight of the motorcycle and rider is called "total sag" or "race sag".