Hubs Bearing Guide
The hub is the central part of your bike&x27;s wheels (front and rear), which connects to the wheel&x27;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&x27;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 &x27;fixie&x27; 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.
TECHNICAL SPECS
Item: MR3040H6-2RS
Closures: RS Sealed
Structure: Ball Bearing
Dimensions: 30 x 40 x 6 mm
ID (inner diameter): 30 mm
OD (outer diameter): 40 mm
Width: 6 mm
Quantity: 1 Lot = 2 PC
Grease
They are characterized by excellent water resistance and load-carrying properties and help provide long-term protection against rust and corrosion.
Bearing Installation and Removal
Bearings should never be installed by pressing on the inner race.
Always press on the outer race with a pilot bushing or similar tool, which will only make contact with the metal side of the outer race.
A bearing press or similar should be used to exert the force needed to press the bearing into the housing.
Ensure that the seating surface is clean and free from rough edges so that they fit true and square.
Quite often bearings can feel fine before fitting, but then feel "notchy" or "rough" after fitting. This is almost always due to the bearings not sitting square and true.
Care needs to be taken that the bearing is started straight and not at an angle to the housing.
Bearing CareTo prolong the life of your bearings, do not direct a high jet of water near areas of your bike where there bearings are located - an ingress of water can lead to premature bearing failure.
The material of this bearing is 52100 Chrome steel, Not waterproof.
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&x27;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.