ROTA GRID OFFROAD 18X8.5X6H/139.7 RL PLAIN SILVER

1. ROTA Grid Offroad: This identifies the brand and model of the wheel, specifically designed for off-road use and manufactured by ROTA.

2. 18x8.5: These numbers represent the dimensions of the wheel. "18" denotes the diameter of the wheel in inches, while "8.5" indicates the width of the wheel in inches.

3. 6H/139.7: This part of the specification refers to the bolt pattern of the wheel. "6H" signifies that the wheel has a 6-lug bolt pattern, meaning there are six bolt holes. "139.7" denotes the bolt circle diameter in millimeters, which is the diameter of an imaginary circle drawn through the center of each bolt hole. In this case, it's 139.7 millimeters.

4. RL PLAIN SILVER: This describes the finish or color of the wheel. "RL" may indicate a round lip design, and "Plain Silver" refers to the finish of the wheel, typically a standard silver color.

So, the "ROTA Grid Offroad 18x8.5x6H/139.7 RL PLAIN SILVER" wheel is an 18-inch diameter, 8.5-inch wide wheel with a 6-lug bolt pattern and a bolt circle diameter of 139.7 millimeters. It features a round lip design and comes in a plain silver finish. These specifications are important for ensuring compatibility and achieving the desired aesthetic for off-road vehicles.