275/40R18 tires are in stock now with 18 options spanning premium, performance, and value brands including Michelin, Continental, Pirelli, Toyo, Nitto, Kumho, General, and Falken. Every order ships free, with Affirm financing available and fast delivery from a nationwide network. Whether you need a summer max-performance tire or a versatile all-season, you can compare the full range of available tires in this size on one page.
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What 275/40R18 tires means
The code breaks down into exact measurements. The 275 is the section width in millimeters (about 10.83 inches across the widest point of the tread). The 40 is the aspect ratio, meaning the sidewall height is 40% of that width — roughly 110 mm, or 4.33 inches. The R stands for radial construction, and the 18 is the wheel diameter in inches this tire mounts to.
Adding two sidewalls to the rim gives an overall tire diameter of about 26.66 inches, and this size turns approximately 756 revolutions per mile. Those figures matter because a matching diameter keeps your speedometer and odometer accurate, the lower-profile 40-series sidewall trades a little ride cushion for sharper steering response and stability, and the 275 width needs adequate fender and suspension clearance.
Vehicles & uses
This is a wide, low-profile size that commonly serves luxury sport sedans and high-performance vehicles, where the balance of grip and comfort matters. The tall wheel and short sidewall favor confident handling and a planted feel at speed. Because exact fitment depends on your specific vehicle, wheel offset, and any suspension changes, always confirm the size against your door-jamb placard or owner's manual before ordering.
Brands & options in 275/40R18 tires
On the premium and performance end, the Continental lineup includes the ExtremeContact Sport 02 and the ContiSportContact 2. From Pirelli you'll find the Cinturato P7 and the updated Cinturato P7 (P7C2). Michelin rounds out the premium tier.
For performance and track-focused driving, the Nitto range covers the street-oriented NT555 G2, the max-performance NT05, the competition NT01, and the NT555RII. The General G-Max AS-07 and Kumho Ecsta Sport PS72 add strong all-season and summer performance choices. On the value side, the Toyo Extensa HP II and Proxes Sport 2, plus Falken options, keep the range accessible.
How to choose
Season
Summer tires deliver the sharpest dry and wet grip in warm conditions but aren't meant for cold or snow. All-season tires trade some peak grip for year-round usability, while dedicated winter tires are built for freezing temperatures and snow. Match the type to your climate and how you drive.
Treadwear & UTQG
The UTQG rating combines treadwear, traction, and temperature grades so you can compare expected longevity and grip between tires. Higher treadwear numbers generally suggest a longer-lasting compound, while max-performance and track tires often prioritize grip over mileage.
Load index & speed rating
The load index is the code after the size (for example the 99 or 103 you'll see in listings), indicating how much weight each tire can safely carry, and XL denotes an extra-load construction. The speed rating letter (W or Y here) marks the tire's maximum rated speed. Meet or exceed your vehicle's original specifications for both.
Warranty
Some models include a mileage treadwear warranty while others — particularly track and max-performance tires — carry none. Check each product page for its specific coverage.
Frequently Asked Questions
What does 275/40R18 tires mean?
It's a tire 275 mm wide (about 10.83 inches) with a sidewall height equal to 40% of that width (roughly 4.33 inches), built as a radial to fit an 18-inch wheel. The overall diameter is about 26.66 inches and it turns roughly 756 revolutions per mile.
How much do 275/40R18 tires cost?
In this size, prices range from about $232 to $568 per tire depending on the brand, model, and performance category, and every order ships free.
Which brands offer 275/40R18 tires?
Currently in stock are 18 options across Michelin, Continental, Pirelli, Toyo, Nitto, Kumho, General, and Falken, covering premium, performance, and value tiers.