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Illustration of bearing tolerances (in micrometers) for a bearing with a 20 mm inner diameter. For illustration, the figure shows the differences in tolerance per ABEC class in micrometers (μm) for a 20 mm inner diameter bearing. [1] A 20 mm ABEC 7 bearing only has a 5 μm tolerance window, whereas an ABEC 1 has twice as wide a tolerance.
Paul began developing the first bicycle suspension fork. In 1989 or 1990, Turner approached Simons for help designing a suspension fork for mountain bikes. Turner had in 1987, with the help of Keith Bontrager, presented a full bike with front and rear suspension at the bicycle industry trade show in Long Beach. The industry was not impressed.
Components of the unsprung mass include the wheel axles, wheel bearings, wheel hubs, tires, and a portion of the weight of driveshafts, springs, shock absorbers, and suspension links. Brakes that are mounted inboard (i.e. as on the drive shaft, and not part of the wheel or its hub) are part of a vehicle's sprung mass.
Attached to the knuckle at its center is a bearing hub, or in many older designs, a spindle to which the wheel bearings are mounted. To resist fore-aft loads such as acceleration and braking, the arms require two bushings or ball joints at the body. Double wishbone suspension in action, displayed at the Toyota Museum in Nagoya, Japan
In a drive suspension, the knuckle has no spindle, but rather has a hub into which is affixed the bearings and shaft of the drive mechanism. The end of the drive mechanism would then have the necessary mounting studs for the wheel/tire and/or brake assembly. Therefore, the wheel assembly would rotate as the drive shaft (or half-shaft) dictates.
If someone tries to sell you an ABEC 11 bearing ask them what it means. —Preceding unsigned comment added by 209.187.5.118 19:09, 17 January 2008 (UTC) I believe the confusion lies in the fact that there is a skateboard wheel co. called ABEC 11. This is a high end wheel company that many professionals refer to as the best.
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