Reply to "Rolling Tire Characteristics"

sturiegelMember

The points on the tire move closer together because the contact patch is a straight line, not an arc. The weight of the rider and the rigidity of the road compresses the tread. Only an unladen bike has a single point of contact as in your illustration.

Taking your original Figure 2, I moved the points in a bit to make Figure 3.

Figure 4 shows the effect of compressing the arc into a straight line, as in a real contact patch. The circles are in the same place on the tread surface. The vertical lines are in the same place in real space.

Since I used MS Paint and not a real finite-element modeling program to do it, I'm sure the effect is exaggerated, but you get the idea.

7/11/084:57 AM

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