Tire Size Guide

315/40R18 Tires

Compare 4 available models across 1 categories, then confirm fitment for your vehicle.

Our Top Pick in 315/40R18
Nitto NT555 G2
Ultra High Performance SummerPerformance

The Nitto NT555 G2 is a strong choice for drivers who prioritize dry and wet grip, with perfect scores in both dry grip and handling, and a wet grip rating of 9 that exceeds the category average.

Perfect dry grip score of 10, significantly above the category average of 8.7, ideal for spirited driving. Wet grip rating of 9 outpaces the ultra-high-performance summer average of 7.6, enhancing safety in wet conditions. Handling score of 10 ensures precise and responsive driving dynamics, a standout feature in this category.
77Spec score (est.)
Full analysis
4 models

Best Ultra High Performance Summer Tires in 315/40R18

All Ultra High Performance Summer tires
Nitto NT555 G2Performance

The Nitto NT555 G2 is a strong choice for drivers who prioritize dry and wet grip, with perfect scores in both dry grip and handling, and a wet grip rating of 9 that exceeds the category average.

  • Perfect dry grip score of 10, significantly above the category average of 8.7, ideal for spirited driving.
  • Wet grip rating of 9 outpaces the ultra-high-performance summer average of 7.6, enhancing safety in wet conditions.

Lack of a treadwear warranty could deter buyers looking for a guaranteed lifespan, especially when competitors offer one.

Treadwear 200Traction AA
Spec score77estimated
Details
Nitto NT555RIIPerformance

The Nitto NT555RII is aimed at drivers who want a tire that can handle the demands of track days or spirited driving sessions.

  • Dry grip rating of 8, while below the category average of 8.7, still offers solid performance for spirited driving.
  • Handling score of 8 matches the dry grip, providing a responsive driving experience.

The extremely low treadwear rating of 100 suggests a very short lifespan, which could be costly for frequent drivers.

Treadwear 100Traction A
Spec score62estimated
Details
Hoosier R7Performance

The Hoosier R7 is tailored for drivers who prioritize dry grip and handling, making it a strong candidate for track days.

  • Dry grip and handling scores of 8 make it a solid choice for track enthusiasts seeking sharp cornering and control.
  • Comfort and noise levels are on par with category averages, making it more livable than some other track-focused options.

Poor wet grip and no treadwear warranty make it unsuitable for those who need reliable performance in rain or want a longer-lasting tire.

Treadwear 40Traction C
Spec score52estimated
Details
Atturo AZ850 DRPerformance

The Atturo AZ850 DR is a compelling choice for drivers who prioritize dry grip and handling above all else.

  • Perfect dry grip score of 10, surpassing the ultra-high performance summer category average of 8.7.
  • Handling is rated at 10, indicating highly responsive steering and cornering capabilities.

Poor wet grip score of 5 — not recommended for drivers who frequently encounter wet conditions.

Spec scoreestimated
Details
Fitment

Vehicles Using 315/40R18

Browse

Popular Brands in 315/40R18

Size decoded

What 315/40R18 Means

315/40R18 designates a tire 315 mm (12.4") wide with a sidewall 40% as tall as it is wide — about 126 mm (5.0") — mounted on a 18-inch wheel. That works out to an overall diameter of roughly 27.9", a circumference of about 87.7", and approximately 722 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.

126 mm

Sidewall height

27.9"

Overall diameter

87.7"

Circumference

722

Revs per mile

Of the 4 315/40R18 tire models we track, the most common category is ultra high performance summer (4 models) — a good indicator of the kind of vehicles and driving this size is designed for.

Before you buy

Frequently Asked Questions

What does 315/40R18 mean?
315/40R18 breaks down as follows: 315mm is the tire's section width (the widest point), 40 is the aspect ratio (sidewall height as a percentage of width), R means radial construction, and 18 is the wheel diameter in inches.
What vehicles use 315/40R18 tires?
315/40R18 is a common fitment for vehicles like the 2023 Dodge Charger, 2023 Dodge Challenger, 2022 Dodge Challenger, 2021 Dodge Challenger and others. Always confirm your specific trim's fitment before purchasing.
How tall is a 315/40R18 tire?
A 315/40R18 tire has a sidewall height of about 126 mm (5.0") and an overall diameter of roughly 27.9", turning approximately 722 revolutions per mile. Actual dimensions vary slightly by manufacturer and model, so confirm against your vehicle's placard before changing sizes.

315/40R18 Research Guides

Confirm 315/40R18 fits your vehicle

Wheel size can vary by trim and option package. Enter your year, make, model, and trim to verify fitment before you order.

Check my vehicle