In a wheel designation size labeled 14 × 7JJ, what do the letters "JJ" signify?

The designation "14 × 7JJ" indicates specific dimensions and characteristics of a wheel. The letters "JJ" specifically denote the shape of the flange area of the rim. In this context, it refers to the style of the bead seating surfaces on the wheel, which is crucial for ensuring that the tire seats properly on the wheel without leakage, particularly under pressure from inflation.

The "JJ" shape is common for various wheel types and helps in determining compatibility with different tire designs. This designation is significant for mechanics and automotive professionals when selecting or replacing wheels and tires to ensure optimal performance and safety. Understanding these specifications aids in maintaining the integrity of the vehicle’s steering and suspension systems.