Tire Size Guide

315/40R21 Tires

Compare 23 available models across 7 categories, then confirm fitment for your vehicle.

Our Top Pick in 315/40R21
Goodyear Eagle F1 Asymmetric 5
Ultra High Performance SummerValue

The Goodyear Eagle F1 Asymmetric 5 is a compelling choice for those who prioritize wet grip and longevity in an ultra-high-performance summer tire.

Wet grip score of 9 significantly exceeds the category average of 7.6, making it a strong performer in rainy conditions. Handling score of 8 aligns with the category's focus on responsive driving dynamics. 60,000-mile treadwear warranty is notably higher than the category average of 37,754 miles, offering extended longevity for an ultra-high-performance tire.
80Spec score (est.)
Full analysis
12 models

Best Ultra High Performance Summer Tires in 315/40R21

All Ultra High Performance Summer tires

The Goodyear Eagle F1 Asymmetric 5 is a compelling choice for those who prioritize wet grip and longevity in an ultra-high-performance summer tire.

  • Wet grip score of 9 significantly exceeds the category average of 7.6, making it a strong performer in rainy conditions.
  • Handling score of 8 aligns with the category's focus on responsive driving dynamics.

The T speed rating is a mismatch for an ultra-high-performance tire, which may deter high-speed enthusiasts.

Treadwear 300Traction AA
Spec score80estimated
Details

The ContiSportContact 5 CSI is a strong choice for drivers who prioritize dry grip and handling.

  • Dry grip score of 9 is above the category average of 8.7, providing strong performance on dry pavement.
  • Handling rating of 9 matches the best in the ultra-high-performance summer category, ideal for spirited driving.

Poor wet grip performance relative to competitors like the Michelin Pilot Sport 4S, which could be a safety concern in wet conditions.

60,000 mi warranty
Spec score72estimated
Details

The ADVAN Sport V107E is a solid choice for drivers who value dry grip and handling above all else.

  • Dry grip and handling both score a perfect 10, leading the ultra-high-performance summer category where the average is 8.7.
  • Treadwear warranty of 55,000 miles significantly exceeds the category average of 37,754 miles, offering better longevity than many competitors.

Wet grip performance is below the category average, which may deter those who frequently drive in rainy conditions.

50,000 mi warrantyTreadwear 240Traction A
Spec score66estimated
Details

The Michelin Latitude Sport 3 is a compelling option for drivers focused on maximizing grip and handling precision.

  • Dry grip and wet grip both score 9, surpassing the category averages of 8.7 and 7.6 respectively, making it a strong performer in both conditions.
  • Handling score of 9 ensures precise steering response, ideal for spirited driving.

The low treadwear rating of 220 suggests a shorter lifespan, which may not suit budget-conscious drivers seeking longevity.

20,000 mi warrantyTreadwear 220Traction AA
Spec score65estimated
Details
Show 8 more ultra high performance summer options
Michelin Pilot Sport 4

20,000 mi warranty · Treadwear 320

61
60
Toyo Tire Proxes Sport

25,000 mi warranty

56
Michelin Pilot Sport 4 SUV

20,000 mi warranty · Treadwear 220

56
Pirelli P Zero PZ4 Sport

Specs on detail page

Atturo AZ850

Specs on detail page

3 models

Best Highway All-Season Truck Tires in 315/40R21

All Highway All-Season Truck tires

The Hankook Dynapro HPX is a solid choice for highway all-season truck drivers who value longevity and dry grip.

  • Treadlife warranty of 70,000 miles exceeds the highway all-season truck category average of 61,048 miles, promising longer service life.
  • Dry grip score of 8.5 surpasses the category average of 7.7, offering reliable traction on dry roads.

Lacks a 3PMSF rating, making it unsuitable for drivers needing reliable winter performance.

70,000 mi warrantyTreadwear 560Traction A
Spec score74estimated
Details

The Open Country Q/T from Toyo Tire is a strong contender for highway all-season truck drivers who prioritize treadlife and dry grip.

  • Treadwear warranty of 65,000 miles exceeds the category average of 61,048 miles, offering above-average durability.
  • Dry grip score of 8.5 outperforms the highway all-season truck category average of 7.7, making it a solid choice for dry road conditions.

Wet grip performance is subpar, making it less suitable for regions with frequent rain.

50,000 mi warrantyTreadwear 520
Spec score66estimated
Details

The Continental Cross Contact LX Sport is best suited for drivers who value treadlife and dry performance above all else.

  • Outstanding treadlife with an 80,000-mile warranty, significantly above the category average of 61,048 miles.
  • Dry grip score of 8.5 exceeds the category average of 7.7, making it a strong performer for on-road handling.

If wet grip is a priority, this tire's below-average score in that area may be a dealbreaker.

Spec scoreestimated
Details
3 models

Best Winter Tires in 315/40R21

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.

Spec scoreestimated
Details

The Nokian Hakkapeliitta R5 SUV is a solid choice for snowbelt SUV owners who prioritize snow traction and longevity.

  • Snow traction score of 8 matches the winter category's expectations, making it reliable for snowy conditions.
  • Treadwear warranty of 65,000 miles exceeds the category average of 54,431 miles, offering longer service life than many winter tires.

Lack of ice traction data might be a concern for those prioritizing icy surface performance.

Spec scoreestimated
Details
Nokian Hakkapeliitta 10 SUVPerformance3PMSF Snow

The Hakkapeliitta 10 SUV is a solid choice for drivers who prioritize dry grip and handling in winter conditions, with scores of 8.5 in both areas.

  • Dry grip score of 8.5 is well above the winter category average of 7.1, making it a strong performer on cold, dry pavement.
  • Handling score of 8.5 suggests responsive steering, which is beneficial for maneuvering in winter conditions.

Lack of 3PMSF certification may deter those needing guaranteed severe snow performance.

Spec scoreestimated
Details
2 models

Best All-Terrain Tires in 315/40R21

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 score77estimated
Details

The Yokohama Geolandar X-CV is a solid choice for drivers who prioritize dry grip and handling in an all-terrain tire.

  • Dry grip score of 8 outperforms the all-terrain category average of 6.6, providing solid on-road traction.
  • Handling score of 8 is above average for the segment, making it a good choice for drivers who prioritize responsive steering.

Lacks a 3PMSF rating, making it less suitable for drivers who encounter severe winter conditions.

50,000 mi warrantyTreadwear 520Traction A
Spec score72estimated
Details
1 model

Best Touring All-Season Tires in 315/40R21

All Touring All-Season tires

The BFGoodrich Advantage Control is a solid choice for those seeking a touring all-season tire with strong dry grip and a comfortable ride.

  • Above-average dry grip with a score of 8.5, surpassing the category average of 7.8.
  • Treadlife warranty of 65,000 miles is slightly above the category average, promising decent longevity.

Subpar wet grip performance compared to category peers, which could be a concern in regions with frequent rain.

65,000 mi warrantyTreadwear 700Traction B
Spec score73estimated
Details
1 model

Best Grand Touring All Season Tires in 315/40R21

All Grand Touring All Season tires

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.

55,000 mi warrantyTreadwear 540Traction A
Spec score71estimated
Details
1 model

Best Performance All-Season Tires in 315/40R21

All Performance 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.

40,000 mi warrantyTreadwear 500Traction A
Spec score68estimated
Details
Browse

Popular Brands in 315/40R21

Size decoded

What 315/40R21 Means

315/40R21 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 21-inch wheel. That works out to an overall diameter of roughly 30.9", a circumference of about 97.1", and approximately 652 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.

126 mm

Sidewall height

30.9"

Overall diameter

97.1"

Circumference

652

Revs per mile

Of the 23 315/40R21 tire models we track, the most common category is ultra high performance summer (12 models), followed by highway all-season truck (3) — a good indicator of the kind of vehicles and driving this size is designed for.

Before you buy

Frequently Asked Questions

What does 315/40R21 mean?
315/40R21 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 21 is the wheel diameter in inches.
What vehicles use 315/40R21 tires?
315/40R21 is a standard tire size found on many trucks, SUVs, and crossovers. Use our vehicle search to confirm your exact fitment.
How tall is a 315/40R21 tire?
A 315/40R21 tire has a sidewall height of about 126 mm (5.0") and an overall diameter of roughly 30.9", turning approximately 652 revolutions per mile. Actual dimensions vary slightly by manufacturer and model, so confirm against your vehicle's placard before changing sizes.

315/40R21 Research Guides

Confirm 315/40R21 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