A wheel with a clamping mechanism that locks the tire bead to the wheel rim, allowing low tire pressures without losing the bead. Used in off-road and racing.
Beadlock is a wheel with a mechanism that physically clamps the tire bead to the wheel rim. Standard wheels rely on tire pressure to keep the bead seated against the rim; if pressure drops too low (during off-road use over rocks or obstacles), the bead can break loose and the tire can spin off the wheel. A beadlock wheel uses a separate ring that bolts to the wheel face, mechanically clamping the bead in place regardless of tire pressure.
Beadlock wheels are essential for serious off-road use (rock crawling, mud bogging, technical trails). Off-road drivers often air down tires to 8-15 PSI for improved traction over rough terrain; this would deflate a standard wheel. Beadlock wheels allow these low pressures safely. The wheels are also used in drag racing (where slick tires can break bead under launch torque) and in racing applications where minimal tire pressure variation is critical.
Beadlock wheels have practical disadvantages. They typically weigh more than standard wheels (heavier construction). They require periodic re-torque of the bead clamp ring bolts (typically every few off-road outings or as specified by the manufacturer). They are also typically not DOT-approved for street use in some jurisdictions, though dual-purpose street/off-road beadlock wheels exist with specific approvals.