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Best 315/30R21 tires

52 rated tires available in this size, scored on dry, wet, snow, comfort and wear.

Top pick in 315/30R21

Michelin CrossClimate 3 Sport

1,297 owner reviews · 5 tests

Check price on Amazon · 315/30R21 Read the review

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Compare two 315/30R21 tires side by side

Every rated 315/30R21 tire, by season

Ranked by our Relative score, weighed against how many reviews and tests stand behind it.

How scores work
Relative score
0–100. Blends road tests (60%) and owner reviews (40%) category by category, the same way on every TireWheelGuide page. With only one of the two, the missing half is estimated from it, so the score stays closer to average. It needs at least one road test or five owner reviews.
Ranking
The score already allows for how much stands behind it: with only a few reviews or tests a tire stays near the typical score. Among similar scores, newer tires rank higher and tires replaced by a newer generation lower.

Best 315/30R21 all-season tires

3
  1. Michelin CrossClimate 3 Sport

    1,297 owner reviews · 5 tests

    85 Check price on Amazon · 315/30R21
  2. Michelin Pilot Sport A/S 3+

    655 owner reviews · 1 test

    72 Check price on Amazon · 315/30R21
  3. Pirelli Cinturato P7 All Season

    56 owner reviews

    62 Check price on Amazon · 315/30R21

Best 315/30R21 summer tires

37
  1. Continental SportContact 7

    1,611 owner reviews · 22 tests

    84 Check price on Amazon · 315/30R21
  2. Pirelli P Zero (PZ5)

    54 owner reviews · 4 tests

    83 Check price on Amazon · 315/30R21
  3. Hankook Ventus Evo

    47 owner reviews · 10 tests

    82 Check price on Amazon · 315/30R21
  4. Bridgestone Potenza Sport Evo

    63 owner reviews · 5 tests

    79 Check price on Amazon · 315/30R21
  5. Michelin Pilot Sport 4 S

    6,632 owner reviews · 27 tests

    83 Check price on Amazon · 315/30R21

25 more rated tires in this size are listed on their brand pages.

Best 315/30R21 winter tires

12
  1. Goodyear Ultra Grip Performance 3

    13 owner reviews · 33 tests

    85 Check price on Amazon · 315/30R21
  2. Bridgestone Blizzak 6

    8 owner reviews · 23 tests

    81 Check price on Amazon · 315/30R21
  3. Michelin Pilot Alpin 5

    30 owner reviews · 21 tests

    87 Check price on Amazon · 315/30R21
  4. Hankook Winter I*cept Evo 4

    2 tests

    79 Check price on Amazon · 315/30R21
  5. Hankook Winter i cept evo3

    22 owner reviews · 17 tests

    78 Check price on Amazon · 315/30R21

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315/30R21 in inches

Overall diameter28.4″
Section width12.4″
Rim diameter21″
Sidewall height95 mm
Circumference89.3″
Revolutions per mile709.1

Revolutions per mile: how many times the tire turns in one mile, the count your speedometer is calibrated to.

Compare 315/30R21 with another size in the tire size calculator

What rims fit 315/30R21 tires?

A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.

Minimum
8.5″
Ideal
10″
Maximum
11″

The rim diameter is fixed at 21″; only the width can change. Rims are usually 70–90% as wide as the tire’s 12.4″ section width.

Fitted from the factory on rims: 21x10.5.

Some factory fitments sit outside that range: 21x11.5, 21x12. Check the rim width approved for your car before you buy.

Sizes often compared with 315/30R21

Close alternatives — each opens in the tire size calculator.

315/30R21VS305/35R20
315/30R21VS315/35R20

315/30R21 — what does it mean?

ParameterMeaning
315The first number is the section width — 315 mm, or about 12.4 inches across the widest part of the tire.
30The second number is the aspect ratio: sidewall height as a percentage of width. At 30%, the sidewall is about 95 mm tall.
R21R means radial construction, which nearly all modern tires use. The number is the rim diameter in inches — this tire fits a 21-inch wheel.