Tire Size Guide

255/40R21 Tires

Compare 39 available models across 7 categories, then confirm fitment for your vehicle.

Our Top Pick in 255/40R21
Dunlop Sport Maxx RT2
Ultra High Performance SummerPerformance

The Dunlop Sport Maxx RT2 is a strong contender for drivers who demand top-tier dry and wet grip from their ultra-high performance summer tires.

Perfect dry grip score of 10, surpassing the ultra-high performance summer category average of 8.7. Wet grip rating of 9 is well above the category average of 7.6, making it reliable in rainy conditions. Comes with a 45,000-mile treadwear warranty, which is above the category average of 37,754 miles.
80Spec score (est.)
Full analysis
20 models

Best Ultra High Performance Summer Tires in 255/40R21

All Ultra High Performance Summer tires

The Dunlop Sport Maxx RT2 is a strong contender for drivers who demand top-tier dry and wet grip from their ultra-high performance summer tires.

  • Perfect dry grip score of 10, surpassing the ultra-high performance summer category average of 8.7.
  • Wet grip rating of 9 is well above the category average of 7.6, making it reliable in rainy conditions.

Average noise levels might deter those seeking a quieter ride for daily commutes.

Treadwear 300Traction AA
Spec score80estimated
Details

The Ventus S1 evo Z is a strong contender for drivers who prioritize dry and wet grip above all else, boasting a perfect dry grip score of 10 and a wet grip score of 9, both of which exceed the…

  • Perfect dry grip score of 10, surpassing the category average of 8.7 — ideal for spirited driving on dry roads.
  • Wet grip rating of 9, which is significantly above the category average of 7.6, ensures reliable performance in wet conditions.

The lack of a treadwear warranty and a lower UTQG rating means this tire may not be cost-effective for high-mileage drivers.

Treadwear 280Traction AA
Spec score79estimated
Details

The Michelin Pilot Sport All Season 4 is a strong contender for drivers who prioritize grip and longevity in an ultra-high-performance summer tire.

  • Dry grip rating of 9 matches the best in the ultra-high-performance summer category, making it ideal for spirited driving.
  • Wet grip score of 9 exceeds the category average of 7.6, providing confidence in rainy conditions.

If comfort is a top priority, consider alternatives with higher comfort scores like the Pirelli P Zero (PZ4).

45,000 mi warrantyTreadwear 540Traction AA
Spec score78estimated
Details

The ContiSportContact 5P is a solid choice for drivers who value high performance in both dry and wet conditions.

  • Dry grip rating of 9, which is above the category average of 8.7, making it a strong performer for spirited driving.
  • Wet grip also scores a 9, significantly higher than the category average of 7.6, providing confidence in rainy conditions.

If you prioritize high-speed capability, the Michelin Pilot Sport 4S with its higher speed rating might be a better choice.

Treadwear 240Traction AA
Spec score78estimated
Details
Show 16 more ultra high performance summer options
Pirelli P Zero

Treadwear 300

76
73
73
Michelin Pilot Sport 4S

30,000 mi warranty · Treadwear 300

69
68
Yokohama ADVAN Sport V107

20,000 mi warranty · Treadwear 240

66
Michelin Pilot Sport EV

20,000 mi warranty · Treadwear 220

53
Michelin Pilot Sport 4 SUV

20,000 mi warranty · Treadwear 220

53
Atturo AZ850

Specs on detail page

7 models

Best Grand Touring All Season Tires in 255/40R21

All Grand Touring All Season tires

The Goodyear Assurance RangeMax is a sensible choice for drivers who value comfort and quietness on long drives.

  • Comfort and noise scores of 8 match the category benchmarks, making it a solid choice for long-distance driving.
  • Treadwear rating of 580 slightly exceeds the category average, suggesting above-average longevity.

Lack of a treadwear mileage warranty could be a concern for budget-conscious buyers seeking guaranteed longevity.

Treadwear 580Traction A
Spec score75estimated
Details

The Michelin Primacy Tour A/S is a solid choice for drivers who value dry grip and handling.

  • Treadlife warranty of 55,000 miles is competitive, though slightly below the category average of 64,578 miles.
  • Dry grip score of 8.5 outperforms the category average of 7.8, providing reliable traction on dry roads.

The lower UTQG treadwear rating of 540 compared to the category average suggests a shorter lifespan, which could be a concern for high-mileage drivers.

45,000 mi warrantyTreadwear 540Traction A
Spec score68estimated
Details
Michelin CrossClimate2Comfort3PMSF Snow

The Michelin CrossClimate2 is a good match for drivers who value comfort and quietness in their grand touring all-season tires.

  • Comfort and noise scores of 8 match the category average, ensuring a smooth and quiet ride typical of grand touring all-season tires.
  • Treadlife rating of 8.17 and a 60,000-mile warranty provide solid longevity, slightly below the category average but still competitive.

Wet grip performance is notably below average, which could be a dealbreaker for drivers in rainy climates.

60,000 mi warrantyTreadwear 640Traction B
Spec score67estimated
Details

The Bridgestone Turanza 6 is a compelling choice for drivers who prioritize dry grip and handling in their grand touring all-season tires.

  • Comfort and noise scores both align with the category averages of 8, making it a balanced choice for quiet and smooth rides.
  • Dry grip and handling scores of 9.5 significantly exceed the category averages of 7.6, offering enhanced performance in dry conditions.

The low treadwear rating of 320 suggests a shorter lifespan, which may not suit drivers looking for maximum longevity.

Treadwear 320Traction A
Spec score66estimated
Details
Show 3 more grand touring all season options
Vredestein Quatrac Pro+

50,000 mi warranty · Treadwear 400

65
Toyo Celsius Sport

40,000 mi warranty · Treadwear 380

62
5 models

Best Winter Tires in 255/40R21

All Winter tires

The Pirelli Scorpion Winter is a solid choice for those who prioritize dry grip and treadlife in a winter tire.

  • 60,000-mile treadwear warranty exceeds the winter category average of 54,431 miles, offering longer usage before replacement.
  • Snow traction score of 8 matches the category average, ensuring reliable performance in typical winter conditions.

Lack of ice traction data may be a concern for those facing frequent icy conditions.

60,000 mi warrantyTreadwear 500Traction A
Spec score74estimated
Details

The Pirelli Scorpion Winter 2 is best suited for drivers who prioritize treadlife and dry road performance in a winter tire.

  • Snow traction score of 8 meets the winter category average, ensuring reliable performance in snowy conditions.
  • Dry grip and handling both score 8.5, significantly above the category averages of 7.1, making it a strong performer on dry winter roads.

Lack of specific ice traction data might be a concern for those in areas with frequent icy conditions.

Treadwear 500Traction A
Spec score73estimated
Details

The Hakkapeliitta R5 EV is a solid choice for winter drivers who prioritize treadlife and dry grip.

  • Treadlife score of 10 and an 80,000-mile warranty far exceed the winter category average of 54,431 miles.
  • Dry grip rating of 7.5 surpasses the category average of 7.1, which is beneficial for those unexpected dry winter days.

Lacks 3PMSF certification, which may not meet the needs of drivers in areas with severe snow conditions.

Spec scoreestimated
Details
Pirelli P Zero WinterSafety3PMSF Snow

The Pirelli P Zero Winter is a solid choice for drivers who prioritize snow traction over other winter driving conditions, with its snow traction score of 8 standing out as a key strength.

  • Snow traction score of 8 is solid, making it reliable in typical winter conditions.
  • Comfort score matches the category average of 6.2, providing a balanced ride for a winter tire.

The lack of a treadwear warranty and below-average wet grip make it less suitable for those driving frequently on wet winter roads.

Traction NONE
Spec scoreestimated
Details
Show 1 more winter option
Vredestein Wintrac Pro

Specs on detail page

3 models

Best Touring All-Season Tires in 255/40R21

All Touring All-Season tires

The Bridgestone Alenza Sport A/S is tailored for drivers who value comfort and quietness in their everyday rides.

  • Comfort and noise scores of 8 align with category benchmarks, ensuring a quiet and smooth ride.
  • Wet grip rating of 7.5 exceeds the category average of 6.9, providing reliable performance in rainy conditions.

The 40,000-mile treadwear warranty is well below the category average, which means more frequent replacements and higher long-term costs.

Treadwear 500Traction A
Spec score73estimated
Details

The Continental CrossContact RX is a comfortable and quiet touring all-season tire, well-suited for drivers who prioritize ride quality.

  • Comfort and noise scores of 8 match the category benchmarks, making it a solid choice for a quiet and smooth ride.
  • Wet grip rating of 7.5 exceeds the category average of 6.9, providing better-than-average performance in rainy conditions.

Lack of a treadwear warranty and low UTQG treadwear rating suggest higher long-term costs compared to competitors with warranties.

Treadwear 480Traction A
Spec score72estimated
Details

The Hankook iON evo AS SUV is a solid choice for SUV owners prioritizing wet grip and comfort in a touring all-season tire.

  • Treadlife rating of 7.8 aligns with the category average, supported by a 50,000-mile warranty.
  • Wet grip score of 7.5 exceeds the category average of 6.9, providing reliable performance in rainy conditions.

The 50,000-mile warranty is shorter than the category average, which may not suit high-mileage drivers looking for long-term value.

50,000 mi warrantyTreadwear 600Traction A
Spec score70estimated
Details
2 models

Best Performance All-Season Tires in 255/40R21

All Performance All-Season tires

The Nexen N5000 Platinum is a compelling option for drivers seeking a performance all-season tire with excellent dry grip and handling.

  • Outstanding dry grip with a perfect score of 10, surpassing the category average of 8.4.
  • Handling is rated at 10, making it a strong choice for drivers who prioritize responsive steering and control.

The lack of a 3PMSF rating means it's not the best choice for drivers who need reliable light snow performance.

55,000 mi warrantyTreadwear 700
Spec score74estimated
Details

The Falken Azenis FK460 A/S is a compelling choice for drivers who prioritize dry grip and handling precision.

  • Dry grip and handling both score a perfect 10, making it a standout choice for spirited driving.
  • Treadlife warranty of 50,000 miles significantly exceeds the category average of 37,754 miles.

Wet grip performance lags behind competitors like the Michelin Pilot Sport 4S, which might be a dealbreaker for those in rainy climates.

50,000 mi warrantyTreadwear 500Traction A
Spec score72estimated
Details
1 model

Best All-Terrain Tires in 255/40R21

All All-Terrain tires

The Pirelli Scorpion Zero All Season is a solid choice for those who need a durable all-terrain tire with a focus on treadlife and handling.

  • Off-road traction is supported by a robust tread pattern and a UTQG treadwear rating of 500, promising durability.
  • Treadwear warranty of 60,000 miles exceeds the category average of 55,717 miles, offering longer coverage than many competitors.

If severe winter performance is a priority, the lack of 3PMSF certification means this tire might not meet your needs.

Treadwear 500Traction A
Spec score73estimated
Details
1 model

Best Max Performance Summer Tires in 255/40R21

All Max Performance Summer tires

The Toyo Proxes Sport 2 is a solid choice for drivers who prioritize wet grip in a max performance summer tire.

  • Wet grip score of 9 surpasses the category average of 7.9, making it a strong performer in rainy conditions.
  • Dry grip and handling both score 8, closely matching the category average, which ensures reliable performance on dry roads.

The lower UTQG treadwear rating of 240 suggests a shorter lifespan, which may not suit those seeking longer-lasting performance tires.

25,000 mi warrantyTreadwear 240Traction AA
Spec score62estimated
Details
Fitment

Vehicles Using 255/40R21

+ 11 more vehicles use this size

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Popular Brands in 255/40R21

Size decoded

What 255/40R21 Means

255/40R21 designates a tire 255 mm (10.0") wide with a sidewall 40% as tall as it is wide — about 102 mm (4.0") — mounted on a 21-inch wheel. That works out to an overall diameter of roughly 29.0", a circumference of about 91.2", and approximately 695 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.

102 mm

Sidewall height

29.0"

Overall diameter

91.2"

Circumference

695

Revs per mile

Of the 39 255/40R21 tire models we track, the most common category is ultra high performance summer (20 models), followed by grand touring all season (7) — a good indicator of the kind of vehicles and driving this size is designed for.

Before you buy

Frequently Asked Questions

What does 255/40R21 mean?
255/40R21 breaks down as follows: 255mm 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 21 is the wheel diameter in inches.
What vehicles use 255/40R21 tires?
255/40R21 is a common fitment for vehicles like the 2026 Genesis GV70, 2025 Alfa Romeo Stelvio, 2025 Genesis GV70, 2025 Rolls Royce Ghost and others. Always confirm your specific trim's fitment before purchasing.
How tall is a 255/40R21 tire?
A 255/40R21 tire has a sidewall height of about 102 mm (4.0") and an overall diameter of roughly 29.0", turning approximately 695 revolutions per mile. Actual dimensions vary slightly by manufacturer and model, so confirm against your vehicle's placard before changing sizes.

255/40R21 Research Guides

Confirm 255/40R21 fits your vehicle

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