255/40R18 tires are in stock right now with 31 options spanning 17 brands, from premium touring rubber to budget-friendly performance choices. Every order ships free, Pirelli to Nokian and beyond, with Affirm financing available and fast delivery from a nationwide network. Browse the full range below or jump straight to all tires to compare.
Shop 255/40R18 Tires In Stock
Showing 31 in stock.
What 255/40R18 tires means
The 255/40R18 code describes the tire's shape and fit. The first number, 255, is the section width in millimeters (about 10.04 inches) measured across the widest part of the tire. The 40 is the aspect ratio, meaning the sidewall height equals 40% of that width — here roughly 102 mm, or about 4.02 inches. The 18 is the wheel diameter in inches this tire is built to mount on.
Put together, a 255/40R18 has an overall diameter of about 26.03 inches and turns roughly 775 revolutions per mile. Those figures matter because overall diameter drives speedometer accuracy and clearance in the wheel well, while the relatively short 40-series sidewall favors responsive steering over a plush, cushioned ride. Staying close to the original diameter keeps your speedometer honest and your gearing unchanged.
Vehicles & uses
This is a performance-oriented size. Industry listings commonly pair 255/40R18 with luxury sport sedans and performance-focused cars, where the wider tread and short sidewall support handling and grip. Because exact fitment depends on your specific vehicle's wheel width, offset, and factory specs, always confirm against your door-jamb placard or owner's manual before ordering.
Brands & options in 255/40R18 tires
The lineup covers every price tier without gaps. On the premium and touring end, Continental offers the ProContact GX, and Pirelli brings both the Cinturato P7 and the all-weather Cinturato Weatheractive.
Performance
Hankook is well represented with the Ventus S1 evo3 K127B and the Ventus evo K137. The Kumho Ecsta Sport A/S PA71 and Nokian Surpass AS01 round out the sporty all-season group, alongside the Nexen N'Fera AU7.
Value
Budget-conscious shoppers can look at Laufenn's S FIT AS LH01, the Sumitomo HTR AS P03, and two Lexani options, the RFX Plus and LX-TWENTY. Additional choices from Falken, Toyo, General, Nitto, Kelly, Hercules, Lionhart and Arroyo are also available.
How to choose
Season: Summer tires deliver the most dry and wet grip in warm weather; all-season tires trade some ultimate grip for year-round versatility and light-winter capability; dedicated winter tires are the safest pick where snow and ice are routine.
Treadwear & UTQG: The UTQG treadwear grade is a relative indicator of expected tread life — higher numbers generally suggest longer wear, though a softer, lower-rated compound often grips better.
Load index & speed rating: Match or exceed the load index and speed rating your vehicle requires. Some 255/40R18 options carry an XL (extra load) designation for added load capacity; check the service description printed on the sidewall.
Warranty: Compare mileage warranties between models, and remember that performance-focused tires often carry shorter warranties than touring designs.
Frequently Asked Questions
What does 255/40R18 mean?
It's a tire size: 255 mm section width, a sidewall height 40% of that width (about 102 mm), mounted on an 18-inch wheel. The overall diameter is roughly 26.03 inches at about 775 revolutions per mile.
How much do 255/40R18 tires cost?
Prices currently range from about $103.59 to $456.94 per tire, depending on brand and performance level.
What vehicles use 255/40R18 tires?
This size is commonly found on luxury sport sedans and performance-oriented cars. Confirm the correct size for your vehicle using the placard in the driver's door jamb before buying.