Offers an "aggressive" look for larger vehicles.
While they can fit some stock rims, many experts recommend a rim width of at least 10.5 inches for the best performance and to avoid excessive wear. Common Options 90 531 305 50 20
: Section width in millimeters (distance from sidewall to sidewall). 50 : Aspect ratio (the sidewall height is 50% of the width). 20 : Diameter of the wheel rim in inches. Physical Dimensions A 305/50R20 tire typically has the following measurements: Total Height: Approximately 32.0 inches . Width: Approximately 12.0 inches . Sidewall Height: Roughly 6.0 inches . Performance & Style Offers an "aggressive" look for larger vehicles
You can find this size in several styles at retailers like Discount Tire or Custom Offsets : 305/50/20 Performance Tires for sale - eBay 50 : Aspect ratio (the sidewall height is 50% of the width)
The numbers you provided refer to the tire size, which is a popular "wide profile" choice for trucks and SUVs. Tire Size Breakdown