ROTA GRID OFFROAD 18X8.5X6H/139.7 RL Steel Gray

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

2. 18x8.5: These numbers represent the dimensions of the wheel. "18" indicates the diameter of the wheel in inches, and "8.5" signifies 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" indicates 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 Steel Gray: This describes the finish or color of the wheel. "RL" may indicate a round lip design, and "Steel Gray" refers to the finish of the wheel, typically a shade of gray that resembles steel.

So, the "ROTA Grid Offroad 18x8.5x6H/139.7 RL Steel Gray" 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 steel gray finish. These specifications are crucial for ensuring compatibility and achieving the desired aesthetic for off-road vehicles.