Definition
The reinforced inner edge of an aircraft tire that seats against the wheel rim. The bead is built around bundles of high-strength steel wires encased in rubber, giving the tire the rigidity needed to hold its shape on the wheel and resist the outward force of inflation pressure.
Plain English
The stiff, wire-reinforced inner ring of a tire that locks onto the metal wheel and keeps the tire firmly in place when it is inflated.
Context Anchor
You encounter the tire bead during aircraft tire inspection, tire mounting, and wheel maintenance.
Derivation
Bead' originally meant a small rounded object, like a prayer bead. In tire construction it refers to the rounded, reinforced edge that runs around the inside circumference of the tire — the part that beads up against the rim.
Why Pilots Care
A properly seated bead keeps the tire secure at high speeds and prevents blowouts or loss of control on takeoff and landing.
Analogy
Think of the bead like the firm lip on a lid that snaps into place. If that lip is damaged or not seated correctly, the lid will not hold securely.
Intuition Check
Do not picture a loose bead or small ball. In a tire, the bead is the reinforced edge that grips the wheel.
Example Sentence 1
During the tire change, the mechanic inspected the bead for cracks before mounting the new tire on the wheel.
Example Sentence 2
Correct inflation pressure helps seat the tire bead evenly against the wheel flange.