What is the rim width?

1 Answers
Sheila
07/30/25 8:27am
The rim size consists of two parameters: the bead seat diameter and the bead seat width. Common notations include 15x6.5; 15x6.5JJ; 15x6.5J; 1565, etc. There are no strict formatting rules. The first number "15" indicates the bead seat diameter, meaning the rim's bead seat diameter is 15 inches. The second number "6.5" represents the bead seat width, indicating the rim's bead seat width is 6.5 inches. When replacing rims, pay attention to the following parameters: 1. Center Bore (CB): Refers to the size of the rim's center hole. Although rims with different center bore sizes can be installed using adapters, this is not recommended for safety reasons. 2. Pitch Circle Diameter (PCD): For example, a rim with a PCD of 5x120mm means it has 5 lug bolts forming a circle with a diameter of 120mm. This value should also match the original specifications. 3. Offset (OFFSET): Also known as the ET value. A positive offset means the mounting surface is outside the centerline, while a negative offset means it's inside. Passenger cars typically have positive offset values, and this parameter significantly affects driving stability and cornering traction.
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