A tire is a ring-shaped structure that surrounds a wheel’s rim to transfer a bicycle’s load from the axle through the wheel to the ground and provide traction on the surface over which the wheel travels. Most bicycle tires are inflatable structures that offer a flexible cushion, absorbing shock as the tire rolls over rough surfaces. Tires also create a footprint, or contact patch, designed to distribute the bicycle’s weight across the surface, providing pressure that avoids marking the surface severely.
A bicycle tire consists of three main components: the carcass, the bead core, and the rubber tread. Almost all tires are equipped with a puncture protection belt. You have three tire options for your road bike, depending on the type of wheel you plan to use:
Before fixing a flat tire on your bike, it’s helpful to familiarize yourself with the components of the wheel. The majority of bike wheels you’ll encounter consist of four parts:
You should change the tires when you notice a change in the way the bike handles, or at the very latest when the tread is worn down to the wear bars. Under-inflated tires will overheat and may fail, while over-inflated tires provide less grip.
Position yourself on the non-drive side of your bike and either open the quick release or unthread the tire thru-axle to remove the wheel. Start by removing the wheel. Keep your bike upright, and if it’s a rear-wheel flat, shift your drivetrain onto the hardest gear.
To patch a tube, start by locating the hole. Pump air into the tube, then listen and feel for the leak. Mark the hole with chalk or hold it under your finger. Use sandpaper or another abrasive to roughen the surface around the hole.
Properly applied patches can last indefinitely.