from inflating too far up into the tire. This forces the sides into the tire which compresses the bead of the tire against the wheel. Dual beadlocks For extreme off-road racing, dual beadlocks—one each on the inner and outer sides of the rim—can be used. Streetlocks Also referred to as "simulated beadlocks". Streetlocks are a decorative element in which the wheel manufacturer casts or machines the appearance of bolt heads into the rim of a wheel. This provides the appearance of beadlocks, but no functional benefits beyond the internal bead seat common to automotive wheels. Motorcycle rim locks Motorcycle tires use a different style of beadlock, also known as a rim lock or bead stopper. Motorcycle tire rim locks clamp both beads at once because the tire is narrow enough to do this conveniently with one device, and also because there is no such thing as an "inside bead" or "outside bead" on a motorcycle tire. A curved metal plate inside the tire presses both beads outward against the inside of the wheel rim to clamp both beads at once in one localized area. A threaded stem attached to the plate is placed through a hole in the "well" of the rim, with the plate inside the tire and the threaded stem on the outside. The rim lock is tightened using either a standard bolt that leaves the threads visible, or a special bolt that covers the threads. The threaded stem or special bolt is visible on the inner surface of the wheel and points towards the axle, just like the valve stem. For motorcycle tires, a device similar to the internal beadlock of 4-wheel drive vehicles can be used. A special inner tube is inflated via its own valve stem to high pressure to push the bead of the tire tight against the wheel. Like the rim lock, this clamps both beads at once. The regular valve stem is used to inflate the tire to the desired pressure. See also Bead breaker Tire changer References Automotive accessories Motorcycle tires and wheels Tires