225/40R17 Tire Size Specifications & Compatible Vehicles

Overall Diameter

611.8 mm

Section Width

225 mm

Sidewall Height

90.0 mm

Circumference

1922.0 mm

Revs/Mile

837

Rim Diameter

17"

Alternative Tire Sizes

These tire sizes are within 3% overall diameter of 225/40R17 and may be used as replacements:

205/50R16 Safe 0.1% · -20mm · -1" rim 225/45R16 Safe 0.5% · same width · -1" rim 225/35R18 Safe 0.5% · same width · +1" rim 205/55R15 Safe 0.9% · -20mm · -2" rim 215/55R15 Safe 0.9% · -10mm · -2" rim 235/45R16 Safe 1.0% · +10mm · -1" rim 215/40R17 Safe 1.3% · -10mm · same rim 235/40R17 Safe 1.3% · +10mm · same rim 245/35R17 Safe 1.4% · +20mm · same rim 215/50R16 Caution 1.6% · -10mm · -1" rim 235/35R18 Caution 1.6% · +10mm · +1" rim 215/45R16 Caution 1.9% · -10mm · -1" rim

Understanding 225/40R17

The tire size 225/40R17 means the tire has a section width of 225mm, an aspect ratio of 40% (the sidewall height is 40% of the width), and fits a 17-inch rim.

Sidewall Height = 225 x 0.4 = 90.0 mm
Overall Diameter = (90.0 x 2) + (17 x 25.4) = 611.8 mm
Circumference = 611.8 x π = 1922.0 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 225/40R17 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.