GarageCalc What 285/35R19 means
285 is the section width in millimeters (11.2 in). 35 is the aspect ratio: the sidewall is 35 percent of the width, so 285 × 0.35 = 100 mm (3.9 in). R is radial construction, and 19 is the wheel diameter in inches (483 mm). Stack two sidewalls on the wheel and you get the overall diameter: 483 + 2 × 100 = 682 mm, or 26.9 in.
A full marking adds a load index and speed rating after the size, for example 285/35R19 91V. Those two codes set how much weight and speed the tire is certified for; look them up in the load index chart and the speed rating chart.
Plus and minus sizing from 285/35R19
Going up one wheel size, the closest match is 295/30R20 at +0.4% diameter with a 89 mm sidewall instead of 100 mm. Going down one size, 285/40R18 is +0.5% with a taller 114 mm sidewall for more comfort and pothole margin. Anything inside 3 percent keeps the speedometer, ABS and gearing effectively stock; the comparison calculator shows the full speedometer table for any pair.
Which cars come with 285/35R19
Typical factory fitments include Chevrolet Corvette C7 Stingray (rear). Tire size changes with trim and wheel option, so confirm on the door-jamb placard before buying.
Frequently asked questions
How tall is a 285/35R19 tire?
26.9 inches (682 mm) in overall diameter: the 19-inch wheel (483 mm) plus two 100 mm sidewalls. Real tires land within about 1 to 2 percent of that depending on brand, tread depth and pressure.
What is 285/35R19 in inches?
26.9 x 11.2 R19: 26.9 inches tall, 11.2 inches wide, on a 19-inch wheel. The sidewall is 3.9 inches and the circumference is 84.4 inches, so the tire turns 751 times per mile.
What tire sizes are equivalent to 285/35R19?
Within 3 percent of the same diameter on the same 19-inch wheel: 275/35R19 (-1.0%), 295/35R19 (+1.0%), 265/40R19 (+1.8%); on a 20-inch wheel: 295/30R20 (+0.4%), 285/30R20 (-0.5%); on an 18-inch wheel: 285/40R18 (+0.5%), 275/40R18 (-0.7%). The percentage is the diameter change, which is also your speedometer error.
Can I use 295/35R19 instead of 285/35R19?
Dimensionally yes: 295/35R19 is 1.0% taller (+7 mm) and 10 mm wider, and at a true 60 mph the speedometer would read 59.4 mph. The extra width needs about 0.20 in of clearance on each side of the tire and a rim width that suits 295 mm.