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6902 Hybrid Ceramic Bearing 15x28x7 mm ABEC-1 ( 1 PC ) Bicycle Bottom Brackets & Spares 6902RS Si3N4 Ball Bearings

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WHAT IS A HYBEID CERAMIC BEARING?

A ceramic hybrid bearing is a combination of ceramic balls and bearing quality steel rings.

Which combine hardened steel rings with rolling elements made of high-performance ceramic materials, are an increasingly popular option for demanding applications.

TECHNICAL SPECS

Model: 6902 RS
Structure: Deep Groove Ball
Material: Hybrid Ceramic

Bore Dia (d): 15 mm
Outer Dia (D): 28 mm
Width (B): 7 mm

Clover: Sealed (2RS)
Lubrication: Grease
Clearance: C0

Quantity: 1 Lot = 1 PC

Special Note:


1, Sometimes the cages will be different.
eg.: 67 series thin-walled bearings, because the inner wall is very thin, will use the crown-shaped iron cage.


2, The grease and sealed are accept custom-made, so sometimes there are different colors of the rubber sealed.
If you mind the sealed color, please contact us. We’ll confirm the stock for you.


3, The standard clearance of bearings is ISO standard C0, the United States standard K25, the clearance value is 3-18um;
If you have special requirements for swinging, please contact us before purchasing to confirm.

This Bearing Structure

Standard Type: A ball bearing is composed of an outer and inner ring, balls, seal and a retainer.

52100 Chrome Steel Outer Ring & Inner Ring +
Si3N4 Ceramic Balls +
Nylon Cage +
Grease + Sealed
= Hybrid Ceramic Bearing

This Bearing Cover

Compared to the open type, the shielded and sealed bearing types provide better protection from contamination and grease leakage.
They are selected based on the application type and environment.

This is 2RS double sealed.

This Bearing Lubrication

One of the most important elements required
for the effective function of bearing arrangements is correct lubrication.

The lubricant separates the metallic bearing
surfaces and thereby reduces friction, preserves the steel parts and acts as an additional barrier against the entry of contaminations or impurities into the bearings.

This Bearing Cage

Retainers keep the balls separated and equally spaced.
Retainer types are set based on the bearing size but can be selected based on the required performance.

This is made of Nylon PA66 Cage.

This Bearing Material

The most common material used to produce the load carrying components in roller bearings is 52100 chrome steel (bearing steel).

These components are the bearings inner and outer rings, balls and rollers.
The chemical composition of this steel has high carbon and about 1.5% chromium content.
Using controlled processing and heat-treating methods the finished bearing components have high strength to resist cracking and a hard surface to resist subsurface rolling contact fatigue.
The typical surface hardness for bearing components made from this material ranges from 60- 64 on the Rockwell hardness C scale (Rc).

This Bearing Balls

Due to this usually very small contacting area ball
bearings have less frictional resistance and are
more suitable in high speed applications.

This is made of Si3N4 Ceramic.

This Bearing Clearance

The term “clearance” is briefly described as the distance that bearing components may move relative to each other at physical extremes.

CN (C0) “normal” clearance
This clearance group is defined as the standard.
Thus CN is not marked on the bearings. Historically the standard clearance was designated as “C0“.

C2 clearance range smaller than CN
C3 clearance range larger than CN

This Bearing Grade

Executive standard:
GB/T 307.1-2005
Rolling bearings Radial bearings Tolerance

MORE BEARINGS DETAIL

Applications: Bicycle Hub

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SHIPPING & DELIVERY

We are proud to offer international shipping services that currently operate in over 200 countries and islands world wide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.

How do you ship packages?

Packages from our warehouse in China will be shipped by ePacket or EMS depending on the weight and size of the product. Packages shipped from our US warehouse are shipped through USPS.

Do you ship worldwide?

Yes. We provide free shipping to over 200 countries around the world. However, there are some locations we are unable to ship to. If you happen to be located in one of those countries we will contact you.

What about customs?

We are not responsible for any custom fees once the items have been shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.

How long does shipping take?

Shipping time varies by location. These are our estimates:
Location *Estimated Shipping Time
United States 10-30 Business days
Canada, Europe 10-30 Business days
Australia, New Zealand 10-30 Business days
Central & South America 15-30 Business days
Asia 10-20 Business days
Africa 15-45 Business days
*This doesn’t include our 2-5 day processing time.

Do you provide tracking information?

Yes, you will receive an email once your order ships that contains your tracking information. If you haven’t received tracking info within 5 days, please contact us.

My tracking says “no information available at the moment”.

For some shipping companies, it takes 2-5 business days for the tracking information to update on the system. If your order was placed more than 5 business days ago and there is still no information on your tracking number, please contact us.

Will my items be sent in one package?

For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you've specified combined shipping.

If you have any other questions, please contact us and we will do our best to help you out.

REFUNDS & RETURNS POLICY

Order cancellation

All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.

Refunds

Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:

  • If you did not receive the product within the guaranteed time( 45 days not including 2-5 day processing) you can request a refund or a reshipment.
  • If you received the wrong item you can request a refund or a reshipment.
  • If you do not want the product you’ve received you may request a refund but you must return the item at your expense and the item must be unused.

We do not issue the refund if:

  • Your order did not arrive due to factors within your control (i.e. providing the wrong shipping address)
  • Your order did not arrive due to exceptional circumstances outside the control of Bike Your Dream (i.e. not cleared by customs, delayed by a natural disaster).
  • Other exceptional circumstances outside the control of

*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on Contact Us page

If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.

Exchanges

If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.

Please do not send your purchase back to us unless we authorise you to do so.

A few reasons why buy from us:

SAFE SHOPPING

We try our best to make your shopping experience not only pleasant, seamless and hassle-free, but also secure.

FREE SHIPPING

Enjoy flexible international shipping services that currently operate in over 200 countries across the world.

FREE RETURNS

It's okay to change your mind! You can send your order back for a full refund, we've got you covered with our full Buyer protection.

NEW ARRIVALS

Brand new products are available on a regular basis.

PRICE PROMISE

We don't want you to choose between the best value and the best service. That's why we offer competitive pricing.

EXCELLENT CUSTOMER SERVICE

Knowledgeable and professional support team is always happy to help you.

EASY TRACKING

Check your order status online. As easy as that!

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