ANDIEZ Dogs Before Dudes Shirt

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ANDIEZ Dogs Before Dudes Shirt

“ Secondly, you seem to be saying that one can increase contact patch, keep the same tire pressure the same, and as a result the "ground force" must increase. This is true, but the "ground force" cannot increase unless the equal and opposite "rider force" is increased.” Yes, that is what I said. Read it again. I fixed the other variables so the applied load, either static system weight or static weight +/- dynamic loading has to increase to maintain sag with increasing contact patch at fixed psi. Therefore a larger volume tyre needs lower psi to maintain sag due to the increasing contact patch for the ideal sag. [Reply] @jddallager: Well said, Can't help but think that all these over thinkers even know what it's like to actually ride a bike and actually enjoy it for being exactly that. Ride your bike [Reply] Contact patch is proportional to pressure and nothing else. The contact patch multiplied by the pressure equals the upwards force that supports the rider. A 24" x 1.25" ANDIEZ Dogs Before Dudes Shirt BMX tyre with 20psi has same contact patch has 29" x 3.0" tyre. All other effects are incorrect. There difference in contact patch shape, but not area. Knobs complicated the issue slightly, but not carcass flexibility, or any other such nonsense. This is such simple physics, it drives me mad that no-one understands It's true.But, this means that a wider tyre uses less "travel" than smaller tire given the same pressure. Since the contact patch has the same area, it has to be "shorter" for a wider tyre, which means that the wider tyre uses less travel.The same with wheel size - it requires a greater force to load a 29inch tire by 1cm than for a 26 inch tyre, because for each 1cm of "travel" contact patch grows quicker for tire with more diameter or wider tire.So, you can have less pressure in a 29inch tyre then in 26 inch tyre even if they have same width and "height".And this is something we all experience every day.

That's why 29ers are said to have more grip - you can get away with less pressure/larger contact patch with the same bottom-out resistance as smaller tire As with most mechanical systems, it's all "a little more complicated than that"... Tyres are complicated because the carcass has stiffness as well as the air pressure behind it. If you let a car tyre go completely flat, the rim probably won't touch the ground, for example. You could roll around on a bike on a few psi on tarmac and not have rim to ground contact, and the contact patch won't follow pressure = force/area. But no need for physics - just find the pressure you're comfortable with and tell everyone else they're wrong! Inertiaman: Are you not conflating the pressure inside the tire with force exerted by bike and rider on the ground, or are they the same thing? If I put my bike on the work stand and inflate my tires to 30psi there is 30 pounds of force applied to every square inch of the tire, it has noting to do with the force between the tire and ground. [Reply] @Inertiaman: "This is hardly lab work. Its basic high school physics." ANDIEZ Dogs Before Dudes Shirt You're right, if tires followed an ideal balloon model you'd use in high school physics, contact patch wouldn't change with tire size. However real tires don't work like that. You have to account for the structure of the tire adding load support. For example, non-pneumatic tires exist. Their contact patch size isn't influenced by pressure at all. Normal tires fall somewhere between your high school physics model and the non-pneumatic tire model. .

Chief Silverback: It may help to proactively distinguish pressure (the psi in the tire) from force (the pounds supported). In your work stand example, the force between tire and ground is zero and the contact patch is zero. Think of the pressure in the tire as the baseline state of a pneumatic system. The tire carcass structure, bead, rim, etc serves as a structure to support that system. So you can have 30 psi in the tire even if its not supporting a load. But when it does support loads, it does so at 30 pounds for every square inch that is in contact with the ground. [Reply] @mountainsofsussex: The system is complicated, but the determinants of contact patch are relatively simple. While sidewall stiffness can support some force independent of tire pressure, it is an insignificant amount in our typical MTB tire case. One can see this directly if you let all the air out of your tires: the bike weight alone is more than enough to leave the rims resting on the ground. With stiff downhill tires, the factor will be greater, and I might consider its role significant in extreme low PSI examples, but at riding pressures it will diminish greatly.Whatever support *is* provided by the sidewall, the ANDIEZ Dogs Before Dudes Shirt factor will essentially cancel when comparing two tires of similar construction which differ only in size (the fundamental "argument" here is the false claim that, all else being equal, a larger tire will have a larger contact patch than a smaller tire)

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