10Pcs/lot Boutique bicycle rear wheel hub bearing MR15268 15268-2RS inner diameter 15 outer diameter 26 width 8
$17.99
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Brand Name: WZZG
Model Number: 15268-2RS
Closures: 2RS Sealed
Structure: Ball Bearing
Dimensions: 15 x 26 x 8 mm
ID (inner diameter): 15 mm
OD (outer diameter): 26 mm
Width: 8 mm
Quantity: 10 PC
Use: Road Bicycles
Material: bearing steel

Wheel Bearing Guide
The hub is the central part of a bicycle wheel (front and rear) that is attached to the rim via spokes and mounts the axle via the hub, allowing the wheel to spin freely on two sets of bearings.
Since bikes have front and rear wheels, they also have front and rear-specific hubs. The design of the front hub is simple enough to allow the wheel to spin, while the rear hub is slightly more complex because it is also part of the bike's transmission - the freewheel or sprocket that drives the rear wheel is attached to the rear hub, and most bikes also have a feature that allows you to Mechanisms for gliding or freeride (except for fixed-gear or "fixed" bicycles and track bicycles).
Your wheels spin more than any other part of your bike. Therefore, having the best bearings for this application is critical to producing the best results.