The bicycle tube can lose air due to a variety of reasons, such as punctures from sharp objects like nails or glass, improper installation causing pinching or damage to the tube, or a faulty valve that is not properly sealing. Additionally, changes in temperature can also cause the air pressure inside the tube to fluctuate, leading to gradual air loss. Regularly checking the tire pressure and inspecting the tube for any signs of damage can help prevent unexpected air loss while riding. **

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The bicycle inner tube may be losing air due to a puncture or a small hole in the tube. This can be caused by riding over sharp objects like glass, thorns, or nails. Additionally, the valve may be loose or damaged, causing air to escape. It is important to inspect the inner tube carefully to identify the source of the air leak and repair or replace the tube as needed. **

A patched bicycle tube may not hold air as well as a brand new tube because the patch creates a potential weak spot where air could potentially leak. However, if the patch is applied correctly and securely, it should still hold air well and be able to function effectively. It is important to properly inspect the patched area and ensure it is well-sealed to prevent any air leakage. **

A patched bicycle tube can hold air just as well as a new tube if the patch is applied correctly. The key is to ensure that the patch is securely and evenly applied to the tube, with no air leaks. If the patch is applied properly, the tube should hold air just as effectively as a new tube. However, if the patch is not applied correctly, it may not hold air as well and could lead to a flat tire. **

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There could be several reasons why no air is going into your bicycle inner tube. One possibility is that the valve stem is not properly aligned with the valve hole in the rim, preventing air from entering. Another possibility is that the valve core is stuck or damaged, preventing air from flowing through. Additionally, there may be a puncture or tear in the inner tube, causing air to escape as soon as it is pumped in. It's important to inspect the valve, valve core, and inner tube for any issues and address them accordingly. **

The air pressure in the bicycle tube changes during the ride due to a combination of factors. As the tire rolls over the ground, it experiences small deformations that cause the air pressure to fluctuate. Additionally, changes in temperature can also affect the air pressure in the tube. As the tire heats up during the ride, the air inside the tube expands, increasing the pressure. Conversely, as the tire cools down, the air contracts, decreasing the pressure. Overall, the air pressure in the bicycle tube can fluctuate during the ride due to these factors. **