Inflating your tyre.
Inflate your tyre carefully. The recommended pressure is indicated on the side of your tyre in PSI or bars (1 bar = 14.51 PSI).
For example on a mountain bike tyre you can find: Pressure = Min 2.5 bar / 35 PSI - Max 4.5 bar / 65 PSI.
These numbers will vary depending on the tyre and its cross section (width).
Tips from the pros.
When inflating your tyre, be sure to inflate it to the correct pressure for the terrain you will be riding on and especially the weather conditions.
When riding in rainy weather, you can reduce the tyre pressure to increase the tyre's grip. On the other hand, when riding in dry weather, you can increase the pressure for better performance.
Measuring tyre wear.
To measure the wear of your tyres, and, above all, know when they need replacing, you need to inspect the tread. This is the part of the tyre that is in direct contact with the ground and therefore determines the tyre's performance.
A tyre needs to be changed when the centre knobs are worn down to the same height as the side knobs. This kind of wear can be felt through a loss of grip when cycling.
Removing your tyre.
To remove your tyre, first deflate the inner tube until no more air comes out. Next, use tyre levers to remove the tyre from the rim.
Putting your tyre back on.
To mount your tyre, first, fit the bead (= the flexible or rigid part, depending on the model, that determines the shape of your tyre) to the rim.
Once you have done this, inflate your inner tube by approximately 30% before fitting it to the rim (inflating it beforehand reduces the risk of pinching the inner tube).
Next, fit the second bead to the rim, starting at the opposite side to the valve.
All you have to do now is inflate your tyre.