Tire Scouter

345/25R21 tires

Compare 3 models made in this size across 2 categories, 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 345/25R21

Michelin Pilot Sport 4S

  • Ultra high performance summer

Best for enthusiast drivers.

The Michelin Pilot Sport 4S is a standout choice for drivers who prioritize dry and wet grip above all else.

  • Dry grip score of 10 leads the ultra high performance summer category, ideal for spirited driving.
  • Wet grip score of 9 significantly exceeds the category average of 7.6, enhancing safety in wet conditions.
  • 30,000-mile treadwear warranty is a rarity in this performance segment, offering peace of mind for longer usage.
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 345/25R21.

69Good
30k mi
300
AA
Y · 186 mph

Every scale below runs from the lowest to the highest spec score among the 3 scored tires in 345/25R21 (59 to 69).

Best ultra high performance summer tires in 345/25R21

2 models, highest spec score first.

All ultra high performance summer tires

  1. Michelin Pilot Sport 4S

    Best for enthusiast drivers.

    69Good
    Warranty
    30k mi
    Treadwear
    300
    Traction
    AA
    Speed rating
    Y · 186 mph
    • Dry grip score of 10 leads the ultra high performance summer category, ideal for spirited driving.
    • Wet grip score of 9 significantly exceeds the category average of 7.6, enhancing safety in wet conditions.
    • The 30,000-mile treadwear warranty may fall short for drivers who cover extensive distances annually.

  2. Michelin Pilot Sport Cup 2

    Best for track enthusiasts.

    67Good
    Warranty
    30k mi
    Treadwear
    180
    Traction
    AA
    Speed rating
    Y · 186 mph
    • Perfect dry grip score of 10, setting the standard in the ultra-high-performance summer category.
    • Wet grip rating of 9 exceeds the category average of 7.6, offering strong performance in damp conditions.
    • The 30,000-mile treadwear warranty may not justify the cost for those seeking longevity over peak performance.

Best winter tires in 345/25R21

1 model, highest spec score first.

All winter tires

  1. Michelin Pilot Alpin PA4

    Severe-snow rated

    Best for performance-oriented winter drivers.

    59FairFrom 2 of 5 specs
    Warranty
    30k mi
    Treadwear
    Not graded
    Traction
    Not graded
    Speed rating
    Y · 186 mph
    • Snow traction score of 8 matches the winter category average, ensuring reliable performance in snowy conditions.
    • 30,000-mile treadwear warranty is a significant advantage over many winter tires that offer no mileage guarantee.
    • Limited treadlife compared to category averages — not the best choice for high-mileage winter driving.

Popular brands in 345/25R21

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

What 345/25R21 means

345/25R21 designates a tire 345 mm (13.6") wide with a sidewall 25% as tall as it is wide — about 86 mm (3.4") — mounted on a 21-inch wheel. That works out to an overall diameter of roughly 27.8", a circumference of about 87.3", and approximately 726 revolutions per mile. Exact figures vary slightly by manufacturer and tread design.

Of the 3 345/25R21 tire models we track, the most common category is ultra high performance summer (2 models), followed by winter (1) — a good indicator of the kind of vehicles and driving this size is designed for.

Sidewall height
86 mm
Overall diameter
27.8 in
Circumference
87.3 in
Revs per mile
726

Frequently asked questions

What does 345/25R21 mean?

345/25R21 breaks down as follows: 345mm is the tire's section width (the widest point), 25 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 345/25R21 tires?

345/25R21 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 345/25R21 tire?

A 345/25R21 tire has a sidewall height of about 86 mm (3.4") and an overall diameter of roughly 27.8", turning approximately 726 revolutions per mile. Actual dimensions vary slightly by manufacturer and model, so confirm against your vehicle's placard before changing sizes.

345/25R21 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 345/25R21 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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