Because of the quality and QC of our bearings products, we get very few returns or warranty items that we need to repair or replace. For the bearing industry in general, no manufacturer offers any warranty for bearings after installation because of the many variables involved such as other manufacturer’s tolerances that the bearings are fitted into, improper tools used during installation, long intervals between lubrication, and many other reasons too long to list here.

Our bearings Tool Warranty:

All bearings' tools have a 2 year warranty against manufacturing defects.

Our bearings warrants its tools to be free from defects in materials or workmanship for a period of 2 years after original purchase. This warranty only applies to the original owner and is not transferable. Claims under this warranty must be made through the retailer/channel where the tool was purchased. Original proof of purchase is required.

All warranty tools must be sent back for inspection. To begin the warranty process and receive an RMA#, please email and include the following items:

Henan Mingzhidu International Trade Co., Ltd. The original sales receipt or invoice.

Henan Mingzhidu International Trade Co., Ltd. A brief description of the warranty issue.

Henan Mingzhidu International Trade Co., Ltd. A photo of the product and its warranty issue.

Henan Mingzhidu International Trade Co., Ltd. Freight charges for items returned to our bearings are the responsibility of the customer.

Bearing Basic Knowledge

  • How do I properly torque my XD-15 bottom bracket?

    The most important part of setting up an XD-15 bottom bracket with Angular Contact (A/C) bearings is getting the preload set correctly. Briefly, these bearings need to be preloaded 40-60 inch lbs. or 5-7 Nm. This is about 5x the torque setting of a standard radial bearing.

Catalogues Download

Here you will find a catalog of the bearings and small parts Bearings. You can look them up in these charts and see their dimensions as well as their capacities. These are the main sizes used in the bicycle industry. Feel free to contact us at if there is anything you can't find on this list.


Please see below for our technical and how-to videos. You can also visit us at our Youtube channel.

Technical Documents

Please see below for our technical documents.

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