At a speed of approx. The last parameter q sy 4 represents the sharp rise of the resistance that occurs after a relatively high critical speed is surpassed. Parameter q sy 3 controls the slight slope of the resistance with speed. The rear tire takes a bigger load and we see rolling resistance rising at a faster rate when compared to the front tire. 20 km/h on level ground, air resistance has already become the main resistance force. The object is said to have reached a terminal velocity. The coefficient is 0.01. I would rather have a 50+g heavier tire than one that rolls horribly. The increase in the effort you need to expend to overcome rolling and drive resistance as you go faster remains roughly constant as your speed increases.
In addition to the rolling resistance, there are also other resistances that must be overcome when riding a bicycle: The air resistance rises in a squared ratio with increased speed. Rolling resistance comes from friction between the wheel tread and the head of the rail partly, which also comes from s certain minute amount of flattening of the surfaces in contact. For example, it takes the same increase in effort to overcome rolling resistance when you go from 8 to 9 mph as it does when you go from 18 to 19 mph. rolling resistance is a huge deal regardless of terrain. The trend does seem to indicate that the rolling deformations cause the rolling resistance to increase.
... it makes sense, that the rolling resistance slows down the speed $\vec{v}$, ... $\begingroup$ Why should the rolling resistance increase the angular speed of a car tyre. As the car moves, your tires are compressed by the weight of the vehicle pressing down on them. Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. The data in the red circle shows the difference on a flat road at a moderate power (150 watts). This is because wind speed, temperature, power input and rolling speed can be controlled to a very high level of accuracy. Second Update at 1240 miles / … Suggestions for your program: The key is that the rolling resistance should be a force trying to make the vehicle stop... not trying to make it go backwards. Parameter q sy 1 governs the initial level of the rolling resistance force and typically lies in between 1 and 2%. Not surprisingly, as the material gets thinner, the speeds increase dramatically. So at a very low speed rolling resistance may be >95% of the total resistance, but at a very high speed rolling resistance may be <5% of the total resistance.
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