Best 315/40R21 Tires
Browse best 315/40R21 tires with 7 tire models available from $156.99.
Best 315/40R21 High Performance All-Season Tires
High performance all-season tires offer a balanced blend of good handling, year-round traction and treadlife.
Best 315/40R21 High Performance Summer Tires
High performance summer tires offer a perfect blend of good handling, dry and wet traction and decent tread wear.
Best 315/40R21 Touring All-Season Tires
Touring all-season tires provide unparallel balance of good year-round traction, comfortable ride and longer tread life.
Best 315/40R21 Ultra High Performance Summer Tires
Ultra high performance summer tires are designed for agile handling on dry and wet roads with good ride quality and decent tread life.
315/40R21 Tire Size Fitment
10 vehicles are equipped with 315/40R21 tires as original equipment. Select vehicle model to find best tires that fit.
315/40R21 Tire Size Specifications
315/40R21 is a Metric tire with a section or tread width of 12.4 inches, wheel diameter of 21 inches, and overall diameter of 30.9 inches. 315/40R21 tire has a circumference of 97 inches, making 653 revolutions per mile.
Overall Diameter: 30.9"
Tread Width: 12.4"
Wheel Diameter: 21"
Sidewall Height: 5"
Revolutions per Mile: 653
315/40R21 Tire Size Conversion
315/40R21 in inches is equivalent to 30.9x12.4R21.
Replacement Sizes for 315/40R21 Tires
315/40R21 tire can be replaced with 21 compatible tire sizes. Select optional plus size to see available tire models.