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Head-to-head Updated

Kumho Ecsta HM KH31 vs Michelin Primacy 3 — Compared

Relative Score (0–100): the weighted average of the categories below, each 60% road tests and 40% owner reviews (comfort 40/60). Based on 0 + 2 road tests and 27 + 195 owner reviews. How we score

Primacy 3 is ahead, 71–66

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Michelin Primacy 3
Tire BMichelin

Primacy 3

Summer

± 5

Tests 73 · 2 tests Owners 67 · 195 reviews

Best test result: #3 of 20 in 2017 Auto Bild Summer Tyre Test (wear)

“I have just put a new set of Michelin Primacy 3 T0 Acoustics on and they have been faultless. Lots of grip, very quiet etc. They were also good last year in the snow and were from blackcircles for about £240 a tyre.”

Category by category

Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.

  1. 66

    Dry

    Primacy 3 +7
    73
    Why this score
    SourceEcsta HM KH31Primacy 3
    Professional tests (TWG score) · – / 2 tests≈ 67 (est.)74
    Reviews found online6570

    Ecsta HM KH31: 60% × 66.7 (est.) + 40% × 64.8 = 66

    Primacy 3: 60% × 74.2 + 40% × 70 = 73

    No road tests of dry for Ecsta HM KH31. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.42).

  2. 68

    Wet

    Primacy 3 +4
    72
    Why this score
    SourceEcsta HM KH31Primacy 3
    Professional tests (TWG score) · – / 2 tests≈ 69 (est.)72
    Reviews found online6772

    Ecsta HM KH31: 60% × 68.7 (est.) + 40% × 67.1 = 68

    Primacy 3: 60% × 71.9 + 40% × 72 = 72

    No road tests of wet for Ecsta HM KH31. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).

  3. 66

    Comfort

    Primacy 3 +2
    68
    Why this score
    SourceEcsta HM KH31Primacy 3
    Professional tests (TWG score)≈ 68 (est.)≈ 69 (est.)
    Reviews found online6568

    Ecsta HM KH31: 40% × 68.4 (est.) + 60% × 65 = 66

    Primacy 3: 40% × 68.9 (est.) + 60% × 67.9 = 68

    No road tests of comfort for Ecsta HM KH31 or Primacy 3. The test half is the tested tires’ average (69): owners’ comfort ratings barely follow the road tests.

  4. 62

    Treadwear

    Primacy 3 +5
    67
    Why this score
    SourceEcsta HM KH31Primacy 3
    Professional tests (TWG score) · – / 1 tests≈ 64 (est.)73
    Reviews found online6057

    Ecsta HM KH31: 60% × 64 (est.) + 40% × 60 = 62

    Primacy 3: 60% × 73.1 + 40% × 56.8 = 67

    No road tests of treadwear for Ecsta HM KH31. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.35).

  5. 65

    Handling (owners)

    Primacy 3 +3
    68
    Why this score
    SourceEcsta HM KH31Primacy 3
    Reviews found online6568
Scores at a glance
CategoryKumho Ecsta HM KH31Michelin Primacy 3
Relative Score 66 71
Dry 66 73
Wet 68 72
Comfort 66 68
Treadwear 62 67
Handling (owners) 65 68

Higher is better. The Relative Score follows your weights below; category scores do not change.

Weight the categories that matter to you

Wet grip starts at “Important”. Treadwear starts at “Neutral” here: road tests measured it for at most one of the two tires, so it rests on owner reviews. Move the sliders and the scores update instantly.

Important
NotLessNeutralImportantMost
Important
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Neutral
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Recomputed
Headline score
± 8

Ecsta HM KH31

± 5

Primacy 3

The professional test results behind the scores

Per discipline: the average % of the best tire over every test both tires were in, and how many of those tests each one won. “Different tests” rows compare results from separate tests.

DisciplineCategoryEcsta HM KH31Primacy 3ΔHead-to-head
Also published by the testers (not in the score)
Overall Ranking Overall #10/14 2012 ACE Touring Summer Tyre Test #1/16 2018 ADAC Summer Tyre Test - 205/55 R16 – Different tests

Pros, cons & observations

Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.

Tire A Ecsta HM KH31

Pros

  • Excellent value for money compared to premium brands
  • Low road noise and high levels of ride comfort
  • Strong dry-weather handling and cornering confidence

Cons

  • Inconsistent wet-weather grip reported by some users
  • Reports of premature or uneven tread wear on certain vehicles
  • Occasional complaints regarding sidewall durability and road hazard susceptibility
All owner themes in the Ecsta HM KH31 review

Tire B Primacy 3

Pros

  • Exceptional ride comfort and low noise levels
  • Strong dry grip and confident handling
  • Smooth, refined high-speed stability and cruising capability

Cons

  • Higher than average purchase price
  • Faster-than-expected tread wear reported by many users
  • Mixed feedback on wet weather performance, with some noting a lack of grip in standing water or snow
All owner themes in the Primacy 3 review

What real owners are saying

From Reddit, forums and review threads. Not part of our score

Tire A

Kumho Ecsta HM KH31

We haven't collected enough community discussion about this tire yet.

Tire B

Michelin Primacy 3

Mixed

Community members generally view the Michelin Primacy 3 as a quiet, smooth, and capable grand touring tire, with several users highlighting the run-flat (ZP) version as superior in comfort to competing run-flats. However, some drivers report fast tread wear, a harsh ride compared to standard non-run-flat alternatives, and note that the model is older and increasingly replaced by newer generations like the Primacy 4.

bobistheoilguy.com ·2022-10-13

“Is your tire size 235/55-18? You might like the Michelin Primacy 3 which is actually a good price for an 18" Michelin. They are summer tires, but that's OK if you have separate winter tires. The Goodyear Assurance Maxlife sounds like something that will last a long time. The Cooper Enduramax is good if you drive over potholes and curbs because it's supposed to be tougher”
mbworld.org

“Continental DWS06 Plus non-runflats, going on my car next week. Have had OEM Michelin Primacy 3's and they are like driving on bricks. I also ordered an OEM donut spare and jack kit for the trunk. Jack kit goes in lower compartment, spare kept under the horizontal floor net (Coupe).”
f30.bimmerpost.com

“The Primacy3 ZP were installed today. Of course, they need a break-in period, but from some highway and city traffic, I'm already sold that these are the best replacement run-flat tires for our 18" size. The car now glides where it previously "sandpapered" its way down the road with the original harsh and noisy Pirellis. Bumps feel far more isolated. The reviews for DriveGuard have been mediocre, not great. These are far better to my senses. The 225/50-18 size is hard to find. Tire Rack carries the Primacy3 ZP, but not in that size. Another tire store in my area confused them with the non-runflat which Michelin has named the same...just Primacy3. Then, realized they couldn't get the ZP version. Very odd wholesale distribution pattern. Discount Tire was able to order them. First day, but very, very pleased. EDIT: My wife even noticed and she never notices anything about cars. She said the car felt smoother to her as a passenger!”
Top themes
#Run-flat ride quality#Tread wear and longevity#Touring comfort and low noise#Model obsolescence and replacements#OE fitment and regional availability#Price and size compatibility

Based on 23 community posts

Specs side by side

Attribute A · Kumho Ecsta HM KH31 B · Michelin Primacy 3
CategorySummerSummer
Vehicle typePassenger Car / CrossoverPassenger Car / Crossover
Sizes available342
Rim diameters16″15″ – 20″
Sizes in common33

Which one should you actually buy?

Kumho Ecsta HM KH31

Michelin Primacy 3

Winner: Michelin Primacy 3 — better dry, treadwear and wet. It leads or ties in every category we score.

Pick tire B You want the most grip on dry roads

Michelin Primacy 3 scores 73 vs 66 on dry.

Pick tire B You want the longest tread life

Michelin Primacy 3 scores 67 vs 62 on treadwear.

Pick tire B Your priority is wet-weather safety

Michelin Primacy 3 scores 72 vs 68 on wet.

Tire A · Kumho Ecsta HM KH31
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Tire B · Michelin Primacy 3
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Ecsta HM KH31 or Primacy 3?

Which is better in the wet, Ecsta HM KH31 or Primacy 3?

Michelin Primacy 3, 72 vs 68 on our wet score.

Which grips better on dry roads, Ecsta HM KH31 or Primacy 3?

Michelin Primacy 3, 73 vs 66 on our dry score.

Which is more comfortable, Ecsta HM KH31 or Primacy 3?

Neither, by our numbers: 66 vs 68 on the comfort score, within 3 points.

Which lasts longer, Ecsta HM KH31 or Primacy 3?

Michelin Primacy 3, 67 vs 62 on our treadwear score.

How do we compare tires?

Every category score blends two independent signals. 60% comes from professional tire tests (braking distances, lap times, noise measurements), each result compared with every other tire in the same test and newer tests counting more. 40% comes from owner reviews found online, adjusted for how generously each site rates. Both use one scale: the average tested tire gets 70, the best 100. When a tire has only one of the two, the missing half is estimated from the other and the score stays closer to average; with no road test and fewer than five owner reviews it gets no score yet.

Handling is the exception: road tests measure it inside the dry and wet scores, so its own row comes from owner ratings only and starts as less important.

Community buzz from Reddit and forums is shown for context only — it never changes the score. Full methodology