Why do bicycle tires get hard when you pump them?

When you pump a bicycle tire, you are increasing the air pressure inside the tire. This causes the tire to expand and become firmer. The increase in pressure is what makes the tire hard.

The amount of pressure that you put in a bicycle tire is important. Too much pressure can cause the tire to burst, while too little pressure can cause the tire to be soft and have a higher rolling resistance. The optimal pressure for a bicycle tire depends on the type of tire and the conditions in which you will be riding.

For example, if you are going to be riding on rough terrain, you will want to put more pressure in your tires to prevent them from getting flats. If you are going to be riding on smooth pavement, you can put less pressure in your tires to make them more comfortable.

You can check the pressure of your bicycle tires with a tire pressure gauge. Most tire pumps have a built-in gauge, or you can purchase a separate gauge at a bike shop.

Here are some tips for pumping your bicycle tires:

* Start by letting out all of the air from the tire.

* Use a tire pump with a built-in gauge to add air to the tire.

* Inflate the tire to the recommended pressure.

* Check the pressure regularly and add air as needed.