285/40R19 Tire Size Specifications & Compatible Vehicles

Overall Diameter

710.6 mm

Section Width

285 mm

Sidewall Height

114.0 mm

Circumference

2232.4 mm

Revs/Mile

721

Rim Diameter

19"

Alternative Tire Sizes

These tire sizes are within 3% overall diameter of 285/40R19 and may be used as replacements:

295/30R21 Safe 0.0% · +10mm · +2" rim 285/35R20 Safe 0.4% · same width · +1" rim 295/35R20 Safe 0.6% · +10mm · +1" rim 305/30R21 Safe 0.8% · +20mm · +2" rim 275/45R18 Safe 0.8% · -10mm · -1" rim 285/30R21 Safe 0.9% · same width · +2" rim 275/40R19 Safe 1.1% · -10mm · same rim 265/35R21 Safe 1.2% · -20mm · +2" rim 265/40R20 Safe 1.3% · -20mm · +1" rim 275/35R20 Safe 1.4% · -10mm · +1" rim 265/45R19 Safe 1.5% · -20mm · same rim 305/35R20 Caution 1.5% · +20mm · +1" rim

Understanding 285/40R19

The tire size 285/40R19 means the tire has a section width of 285mm, an aspect ratio of 40% (the sidewall height is 40% of the width), and fits a 19-inch rim.

Sidewall Height = 285 x 0.4 = 114.0 mm
Overall Diameter = (114.0 x 2) + (19 x 25.4) = 710.6 mm
Circumference = 710.6 x π = 2232.4 mm

With an aspect ratio of 40%, this is a low-profile tire. Low-profile tires offer sharper steering response and better cornering stability, but provide a firmer ride and are more susceptible to pothole damage. They are commonly found on sport sedans and performance vehicles.

Choosing Replacement Tires

When replacing 285/40R19 tires, verify the size matches your vehicle's tire placard (typically found on the driver's door jamb or in the owner's manual). The NHTSA Tire Ratings Search tool lets you look up manufacturer load and speed ratings for specific tires.

Key factors beyond size: load index (must meet or exceed the vehicle's requirement), speed rating (must match or exceed the original specification), and seasonal type (all-season, summer, or winter) based on your driving conditions. The U.S. Tire Manufacturers Association recommends replacing all four tires at once, or at minimum in pairs on the same axle.