6903-2RS Stainless Bearing 17*30*7 mm 6903 RS Bicycle Hub Front Rear Hubs Wheel

Description

HUBS BEARING GUIDE
The hub is the central part of your bike's wheels (front and rear), which connects to the wheel's rim via 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 simply designed to enable the wheel to spin, while the rear hub is a little more complex as it also forms part of the bike's transmission – the cassette or sprocket which drives the rear wheel is attached to the rear hub, which on most bikes also features mechanism to allow you to coast or freewheel (exceptions being fixed-gear or 'fixie' bikes and track bikes).
Your wheels spin more than any other part of your bike. Therefore, having the best bearings in this application is crucial to producing the best results.
DETAILS
Item: SC6903-2RS
Closures: 2RS Sealed
Structure: Ceramic Ball Bearing
Dimensions: 17 x 30 x 7 mm
ID (inner diameter): 17 mm
OD (outer diameter): 30 mm
Width: 7 mm
Quantity: 1 Lot = 1 PC
A SPECIAL STRUCTURE
Besides the patch where your tires meet the road, what's the next spinning component that can either slow you down or let you roll faster?
You would be correct if you said hubs, but that component would be more accurately described as the bearings inside.
And if you've put this Hub Bearings ABEC-3 bearings inside, you've just upgraded your hub to another level.
1.WHY DO THE BEARINGS I RECEIVE HAVE SHAKING?
The clearance of the bearing is related to the play.
The default is the standard C0 clearance, which is usually 3-18um.
The corresponding principle is shown in the figure below.
If you don't need to shake, please choose C2 small clearance bearing,
If you have any questions, please contact us before purchasing.
2.WHAT IS THE ACCURACY OF ABEC-1?
ABEC is the American ANSI standard.
The corresponding German DIN standard and international ISO standard are as follows:
3.DO YOU PROVIDE LOGISTICS TRACKING INFORMATION?
Yes, all our products provide full logistics tracking,
And the products you buy are all new. We will buy transportation insurance for you.
If the product is damaged or lost during transportation, you can get paid.