Bicycles, he told me, are the most efficient form of transportation by far because they roll on ball bearings. All the moving parts — the wheels, the pedals and cranks, the steering column — they all ...

Wheels turning at 800 revolutions per mile can generate a lot of friction and heat. Roller-type or ball bearings packed in grease inside all four wheel hubs allow wheels to spin freely without ...

It won't be hard to tell if your vehicle has broken wheel bearings. The most common symptoms of worn wheel bearings are squealing or grinding noises that get louder the faster you go. The noise ...