There are two common types of bicycle tires on the market.
Clincher tires are by far the most popular option since it's much easier to repair a flat tire by either replacing the tube inside, patching the tube or waiting for tubeless sealant to seal the hole.
Tubular tires are popular with racers due to their weight savings and ability to hold a higher air pressure. However, if you get a flat tire it will most likely need to be replaced since the inner-tube is built into the tire. Tubular tires are glued to the rim since there is no way of properly securing them to a rim other than air pressure.
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