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Hubs Bearing GuideThe hub is the central part of your bike's wheels (front and rear), which connects to the wheel's rim through the spokes and through which the axle is fitted, enabling the wheel to freely spin on two sets of bearings.As bikes have front and rear wheels, so too have they front- and rear-specific hubs. The front hub is just designed to allow the wheel to spin, whereas the rear hub is slightly more complicated because it additionally types part of the bike's transmission – the cassette or sprocket which drives the rear wheel is hooked up to the rear hub, which on maximum motorcycles additionally elements mechanism to permit you to coast or freewheel (exceptions being fixed-gear or 'fixie' motorcycles and tune bikes).Your wheels spin more than every other a part of your bike. Therefore, having the finest bearings on this utility is crucial to producing the best results.TECHNICAL SPECSItem: MR2437-HC-2RSClosures: 2RS SealedStructure: Ceramic Ball BearingDimensions: 24 x 37 x 7 mm ID (inner diameter): 24 mmOD (outer diameter): 37 mmWidth: 7 mmQuantity: 1 Lot = 1 PCF A Q1. Why do the bearings I obtained have shaking?The clearance of the bearing is said to the play.The default is the traditional C0 clearance, which is always 3-18um.The corresponding principle is shown within the determine below.If you don't deserve to shake, please want C2 small clearance bearing.If you've got any questions, please touch us before purchasing.2. What is the accuracy of ABEC-1?3. Do you provide logistics tracking information?