All CYSUM bikes from cysum.com are covered under our manufacturer's warranty for the original owner against all manufacturing defects (All free Accessories are not covered by warranty service).

The warranty would be registered automatically when the initial purchaser ordered it in the online shop. So the warranty is under the INITIAL PURCHASER and the 1-year warranty would be started since the initial owner has received it.

As for the warranty transfer, the transferee can only enjoy the warranty when the following two conditions are met at the same time:

The 1-year package hasn't expired since the initial owner has received it

Have the initial owner's name & the initial order number.

Frames are covered by a replacement warranty for 5 years, including structural damage, breakage, etc.

Frame issues that are excluded from this warranty include but are not limited to:

Corrosion

Paint fade, scratches, impact marks

Impact damage

Non-reversible modification (drilling/welding)

Chain guard mount to the frame if applicable

CYSUM batteries are covered by a 1-year prorated warranty.

During 1 year of service – A defective battery will be repaired or replaced at no cost to the customer. The warranty period for a repaired or replaced battery remains unchanged based on the original purchase date.

Batteries can be assessed and found defective directly by CYSUM only.

This Limited Warranty does not cover:

Defects or damage resulting from accident, abuse, misuse, abnormal use (including but not limited to stunt riding, racing, or other similar activities not consistent with the intended use of the Products), improper storage, abnormal exposure to liquid, chemicals, moisture, abrasives, sand or dirt, neglect, or abnormal physical, electrical or electromechanical stress;

Defects or damage caused by private modification;

Scratches, dents, and cosmetic damage, unless caused by CYSUM;

Ordinary wear and tear;

Defects or damage caused by the assembly, testing, operation, maintenance, installation, service, repair, or adjustment in a manner that varies from Assembly Instructions & Owners Manual;

Defects or damage resulting from external causes such as collision, fire, flooding, windstorm, lightning, earthquake, exposure to weather conditions, theft, blown 

fuse, or improper use of any electrical source;

In addition, with respect to the battery, this Limited Warranty does not cover defects or damage:

Caused by charging by a battery charger not intended or appropriate for use with the Battery or the improper use of a battery charger;

Where any of the seals on the battery are broken or show evidence of tampering;

Where the Battery has been used in equipment other than the Bike for which it is specified;

Original parts & components are covered by a 1-year limited warranty, damaged parts will be replaced free of charge, you do not need to pay any fees

This Limited Warranty does not cover:

Ordinary wear and tear is not the result of defects in workmanship or materials. Wear and tear can be assessed by CYSUM. Parts not typically covered include but are not limited to Brake Pads, Spokes, Tires/Tubes, Chains, Chain Rings, Cassettes, Crankset, etc.

Defects or damage resulting from accident, abuse, misuse, abnormal use (including but not limited to stunt riding, racing, or other similar activities not consistent with the intended use of the Products), improper storage, abnormal exposure to liquid, chemicals, moisture, abrasives, sand or dirt, neglect, or abnormal physical, electrical or electromechanical stress.

Scratches, dents, and cosmetic damage not caused by CYSUM.

Defects or damage caused by improper assembly, testing, operation, maintenance, installation, service, repair, or adjustment in a manner that varies from Assembly 

Instructions & Owners Manual.

Defects or damage resulting from external causes, such as collision, fire, flooding, windstorm, lightning, earthquake, exposure to weather conditions, theft, blown fuse, or improper use of any electrical source.

All claims to this warranty must be made through CYSUM and submitted to customer@cysum.com. Proofs of purchase and photos or videos of the damaged product are required with any warranty request. Before making a warranty claim, we suggest that you contact us at customer@cysum.com as there may be a simple fix for your problem.

CYSUM will not replace any part without first seeing photos or videos of the damaged product. Customers need to provide us with evidence by email.

In rare instances, the item received may be damaged during transportation. If shipping damage occurs, please contact customer@cysum.com and provide us with photo or video proof.

NOTICE: we will not accept Shipping Damage Claims later than 7 days from receipt of products.

Usually, we can provide replacement service for damaged parts that are not covered by the warranty or beyond the warranty period. You only need to pay the shipping fee and a very low cost to get the original parts.

Please contact us at customer@cysum.com