Tire Scouter

315/40R18 tires

Compare 4 models made in this size across 1 category, ranked by spec score, then confirm fitment for your vehicle.

Spec scores are estimates from five manufacturer specs, not road tests. How we score

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Our top pick in 315/40R18

Nitto NT555 G2

  • Ultra high performance summer

Best for enthusiast drivers.

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.
Full analysis

The highest spec score among ultra high performance summer tires in this size that we have analysis for, the most common category for 315/40R18.

77Strong
None listed
200
AA
Z · 149+ mph

Every scale below runs from the lowest to the highest spec score among the 3 scored tires in 315/40R18 (52 to 77).

Best ultra high performance summer tires in 315/40R18

4 models, highest spec score first.

All ultra high performance summer tires

  1. Nitto NT555 G2

    Best for enthusiast drivers.

    77StrongFrom 4 of 5 specs
    Warranty
    None listed
    Treadwear
    200
    Traction
    AA
    Speed rating
    Z · 149+ mph
    • 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.

  2. Nitto NT555RII

    Best for weekend track enthusiasts.

    68GoodFrom 4 of 5 specs
    Warranty
    None listed
    Treadwear
    100
    Traction
    A
    Speed rating
    W · 168 mph
    • 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.

  3. Hoosier R7

    Best for track-day enthusiasts.

    52FairFrom 4 of 5 specs
    Warranty
    None listed
    Treadwear
    40
    Traction
    C
    Speed rating
    W · 168 mph
    • 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.

  4. Atturo AZ850 DR

    Best for track enthusiasts.

    Not enough spec data
    Warranty
    None listed
    Treadwear
    Not graded
    Traction
    Not graded
    Speed rating
    Y · 186 mph
    • 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.

Vehicles that use 315/40R18

A sample of recent vehicles whose factory front size is 315/40R18. Sizes can vary by trim, so confirm yours before you buy.

  • 2023 Dodge Challenger
  • 2023 Dodge Charger
  • 2022 Dodge Challenger
  • 2021 Dodge Challenger
  • 2018 Dodge Challenger

Popular brands in 315/40R18

The number beside each brand is how many of its models come in this size.

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.

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.

Sidewall height
126 mm
Overall diameter
27.9 in
Circumference
87.7 in
Revs per mile
722

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 Challenger, 2023 Dodge Charger, 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

Summer vs all-season tires

Where summer tires lose grip, the cold-cracking risk, and what all-season tires trade for their range.

Read the guide

Speed rating chart

A practical chart for common tire speed ratings and what they mean for everyday driving.

Read the guide

Changing tire size

Plus-sizing and alternate sizes: diameter limits, load and speed ratings, and speedometer error.

Read the guide

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.

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