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What is the function of the Bearing 5×11×4 (21120) on the YIKONG YK4107 RC Car?
The YIKONG YK4107 Bearing 5×11×4 (21120) is a metal ball bearing used in the drivetrain and rotating assemblies of the crawler. Its main function is to...
Why is my YIKONG YK4107 RC Car making noise from the drivetrain?
Grinding or clicking noises from the drivetrain of your YIKONG YK4107 can be caused by worn, dry, or damaged bearings, including the Bearing 12x18x4 (21122). If...
Why is my YIKONG YK4102 RC Car steering feeling loose or vague?
Loose or vague steering on your YIKONG YK4102 is often caused by worn Ball Linkage Ends (13014) developing play at the pivot points. This is a...
What Problems Can a Faulty Bearing Cause in the YIKONG YK4107 RC Car?

The YIKONG YK4107 RC Car Bearing 5×11×4 (Part No. 21120) is a critical drivetrain component that supports rotating parts while minimizing friction. If the bearing becomes worn, dry, rusty, or damaged, it can reduce drivetrain efficiency, accelerate wear on surrounding components, and negatively affect the performance of your YIKONG YK4107 RC...

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Recent posts

What is the function of the Bearing 5×11×4 (21120) on the YIKONG YK4107 RC Car?
The YIKONG YK4107 Bearing 5×11×4 (21120) is a metal ball bearing used in the drivetrain and rotating assemblies of the crawler. Its main function is to...
Why is my YIKONG YK4107 RC Car making noise from the drivetrain?
Grinding or clicking noises from the drivetrain of your YIKONG YK4107 can be caused by worn, dry, or damaged bearings, including the Bearing 12x18x4 (21122). If...
Why is my YIKONG YK4102 RC Car steering feeling loose or vague?
Loose or vague steering on your YIKONG YK4102 is often caused by worn Ball Linkage Ends (13014) developing play at the pivot points. This is a...