All of it. The 10 percent figure you occasionally see is nonsense that a lot of people believe just because they've seen it so much.
Quick Answer. Some things that cause a vehicle's front end to make a clunking noise are worn ball joints, a damaged tie rod, broken or loose sway-bar links, hard or damaged shocks, and faulty shock mounts. An automotive professional can inspect the vehicle's front end to locate the source of the clunk. Continue Reading.
More than that may cause a vibration and/or tell you the bearing is failing. A sawtooth or heel-and-toe wear pattern on the tires can also produce vibrations and noise that may be speed sensitive. This type of wear is common on the rear tires of some front-wheel-drive cars, and may be caused by a toe-out condition on one or both rear wheels.