But they do require periodic downtime for mechanical maintenance, such as ball bearing replacement. The Davis seat used rollers in a race similar to a ball bearing. It also allowed for precision ball alignment inside the ball bearing. The ABEC scale is an industry accepted standard for the tolerances of a ball bearing. One year later, Toyo founded Senyo Kosakuki Kenkyujo, a maker of ball bearing equipment. The R34 turbos received a ball bearing core. The turbocharger now used a more efficient ball bearing center section. Modern equivalents of the rope are nylon cord or metal chains on ball bearing joints. Cages are typically used to secure the balls in a Conrad-style ball bearing. Failure of the ball bearing within the IMS leads to varying degrees of engine failure. The 360 degrees crankshaft uses three roller bearings and a ball bearing. These can be friction bearing, ball bearing, or roller bearing. The new ball bearing was successful from the outset. There are several common designs of ball bearing, each offering various performance trade-offs. This new powerplant featured five main bearings with an unusual ball bearing system.