285/40R20 tire size meaning:
285 → Tire width in millimeters
The tire is 285 mm wide.
40 → Aspect ratio (sidewall height)
The sidewall height is 40% of 285 mm
= about 114 mm.
R → Radial construction
Modern standard tire design.
20 → Rim diameter
Fits a 20-inch wheel.
Common vehicles using 285/40R20
This size is often found on:
Performance SUVs
Luxury SUVs
Sports trucks
Examples include:
BMW X5
Porsche Cayenne
Range Rover Sport
Dodge Durango
Characteristics
Wide tire for strong road grip
Better handling and stability
Sporty appearance
Lower sidewall gives firmer ride comfort compared to taller tires
Approximate dimensions
Sidewall height: 114 mm
Overall tire diameter: about 29 inches (748 mm)