The vehicle-sensitive retractor has an improved universal support assembly and inertia mechanism. The inertia mechanism is a pendulum assembly which includes a pendulum head in contact with an actuating means. The support assembly for the pendulum assembly includes a flywheel, a pendulum support, an axle for the flywheel and a flywheel support. The pendulum support upon which the pendulum head is disposed is mounted on the flywheel. The flywheel and pendulum assembly are adapted to pivot to a variety of operable static positions to which the pendulum assembly is automatically adjustable according to the position in which the retractor is oriented by virtue of installation in the vehicle. The axle for the flywheel is adapted to allow the flywheel to pivot. The flywheel support is mounted on the retractor and is adapted to support the flywheel and the flywheel axle. The retractor may be tilted for installation without having to redesign the pendulum assembly and support assembly.