Operation CHARM: Car repair manuals for everyone.

Tire Mounting and Dismounting

Use a tire changing machine to mount or dismount tires. Follow the manufacturer's instructions. Do not use hand tools or tire irons to change a tire as they may damage the tire bead, or wheel rim flanges.

Rim bead seats should be cleaned with a wire brush or coarse steel wool to remove old rubber and light rust or corrosion. Before mounting or dismounting a tire, the bead area should be cleaned and well lubricated.

WARNING: Do not stand over the tire when inflating. The bead may break when it snaps over the safety hump, and cause serious personal injury. Do not exceed 275 kPa (40 psi) pressure when inflating. If 275 kPa (40 psi) pressure will not seat beads, deflate, relubricate, and re-inflate. Overinflation may cause the bead to break and result in personal injury.

CAUTION: It is important to note that damage to either the tire mounting surface or the wheel mounting holes can result from the use of improper wheel attachment or tire mounting techniques. It takes 70 seconds for all the air to completely exhaust from a large tire. Failure to follow proper procedures could cause the tire changer to put enough force on the tire to bend the wheel at the mounting surface. Such damage may result in vibration and/or shimmy and under severe use lead to cracking.

Install the valve core and inflate to proper air pressure. Check the locking rings of the tire to make sure they show around the rim flanges on both sides of the wheel.