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Depends on how you look at it. Tire + lots of pressurized air inside will weigh a tad more than tire with only a little air inside. But the actual tire casing will weigh the same whether it's inflated or not.
A full tire is heavier than a flat tire. When a they are both flat they weigh the same but added air makes the full tire heavier.
it is actually smaller
No, heavier by the weight of the extra air put inside it. Even if you filled the tire with helium it is still heavier, although the additional weight would be less than the additional weight of air.
When a tire is properly inflated it will be level to the ground. Over inflated and the middle of the tire has the most pressure on the ground. Under inflated and the sides of the tire have the most pressure on the ground.
The same as a tire that has not been inflated.
As a bike, or any vehicle with inflated wheels roll forward, the tire gets deformed, kinda squashed out. Scrunching up the rübber takes energy, and the more scrunching the more energy it steals. With a properly inflated tire the folds and waves of the tire is quite small, so there's not a lot of power lost. But with a flat tire the folds and deformation is bigger, and so is the energy loss.
At minimum: a jack, a lug wrench (for the lug nuts), and a spare tire inflated properly. Helpful but not requiredn: tire blocks, gloves, and a flashlight (depending on light conditions).
Two things could cause the tire to make a noise sounding like a flat tire even though the tire is fully inflated. First, if the tire has a big enough flat spot on the tread surface and second if the radial plies in the tire have separated letting air between the belts causing patches of the tread surface to bulge.Answeri test drove a geo that had loose lug nits on it that made a noise like that
Any tire inflated with a gas (air or nitrogen ) is a pneumatic tire.
Any tire inflated with a gas (air or nitrogen ) is a pneumatic tire.
The tires are developing a flat spot from sitting overnight. The tire sits there in the cold and the rubber contacting the driveway becomes rigid. Some tires are worse than others when it comes to this. As the tire warms up the flat spot disappears as the rubber becomes more flexible, and the noise & vibration stops. Under-inflated tires are more susceptible to this. Keep your tires inflated to the factory recommended specs and that will help.