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Head-to-head Updated September 2026

Kumho Solus HS51 Harmony Sports vs Michelin Primacy 4 — Compared (September 2026)

Our Relative Score blends 60% objective test data with 40% owner-review signal — so any two tires can be compared even if they were never tested on the same day.

Tire A Kumho

Kumho Solus HS51 Harmony Sports

Summer Premium Touring tires

Kumho Solus HS51 Harmony Sports tread pattern
Objective (60%)
63/100
1 professional test
User signal (40%)
76/100
5 owner reviews
Dry
72
Wet
86
Comfort
37
Noise
–
Treadwear
80
Handling
65

Prices change daily — check the retailer for your size.

VS
Tire B Michelin

Michelin Primacy 4

Summer Premium Touring tires

Michelin Primacy 4 tread pattern
Objective (60%)
90/100
23 professional tests
User signal (40%)
79/100
185 owner reviews
Dry
87
Wet
83
Comfort
77
Noise
75
Treadwear
82
Handling
77

Prices change daily — check the retailer for your size.

VerdictWinner: Michelin Primacy 4 — better comfort, dry and handling. Pick the Kumho Solus HS51 Harmony Sports if wet matters most to you.
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Category breakdown

6 categories, side by side

Each bar is the Relative Score for that category. Expand a tile to see the test results and owner ratings behind it.

Dry

Weight: Neutral
Score (0–100) Primacy 4 leads by 15
A — Kumho Solus HS51 Harmony Sports
72
B — Michelin Primacy 4
87
Why this score
SourceSolus HS51 Harmony SportsPrimacy 4
Professional tests (TWG score) 63 88
Tyre Reviews owners 85 85
Dry Braking (% of best) 91% 97%

Wet

Weight: Important
Score (0–100) Solus HS51 Harmony Sports leads by 3
A — Kumho Solus HS51 Harmony Sports
86
B — Michelin Primacy 4
83
Why this score
SourceSolus HS51 Harmony SportsPrimacy 4
Professional tests (TWG score) 90 85
Tyre Reviews owners 80 81
Wet Braking (% of best) 95% 94%
Wet Handling (% of best) 96% 97%

Comfort

Weight: Neutral
Score (0–100) Primacy 4 leads by 40
A — Kumho Solus HS51 Harmony Sports
37
B — Michelin Primacy 4
77
Why this score
SourceSolus HS51 Harmony SportsPrimacy 4
Professional tests (TWG score) 1 74
Tyre Reviews owners 90 83

Noise

Weight: Neutral
Score (0–100)
A — Kumho Solus HS51 Harmony Sports
–
B — Michelin Primacy 4
75
Why this score
SourceSolus HS51 Harmony SportsPrimacy 4
Professional tests (TWG score) – 75

Treadwear

Weight: Important
Score (0–100) Primacy 4 leads by 2
A — Kumho Solus HS51 Harmony Sports
80
B — Michelin Primacy 4
82
Why this score
SourceSolus HS51 Harmony SportsPrimacy 4
Tyre Reviews owners 80 82

Handling

Weight: Neutral
Score (0–100) Primacy 4 leads by 12
A — Kumho Solus HS51 Harmony Sports
65
B — Michelin Primacy 4
77
Why this score
SourceSolus HS51 Harmony SportsPrimacy 4
Tyre Reviews owners 65 77
DriverReviews owners – 86

Scores at a glance

Kumho Solus HS51 Harmony Sports vs Michelin Primacy 4: scores by category (0–100)
CategoryKumho Solus HS51 Harmony SportsMichelin Primacy 4
Relative Score 71 82
Dry 72 87
Wet 86 83
Comfort 37 77
Noise – 75
Treadwear 80 82
Handling 65 77

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

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Wet grip and treadwear start at “Important” — the two things buyers rank highest. Move the sliders and the scores update instantly.

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Recomputed
Headline score

Tire A

Tire B

Only categories both tires have data for count toward the headline score.

Test data

The professional test results behind the scores

Each result is shown as % of the best tire in that test. “Same test” rows are the strictest comparison: both tires were measured side by side.

DisciplineCategoryTire ATire BΔBoth?
Dry Braking Dry 91% #9/10 · 2020 Teknikens 17 Inch Summer Tyre Test 97% #5/50 · 2023 ADAC Summer Tyre Test -5.9 Different tests
Rolling Resistance Efficiency 94% #10/10 · 2020 Teknikens 17 Inch Summer Tyre Test 82% #5/13 · Tyre Reviews Best Summer Touring Tyres +11.7 Different tests
Overall Ranking Overall 14% #7/10 · 2020 Teknikens 17 Inch Summer Tyre Test 20% #5/7 · The Best Touring Tyres for 2025 Tested -5.7 Different tests
Straight Aqua Straight 100% #1/10 · 2020 Teknikens 17 Inch Summer Tyre Test 98% #8/10 · 2024 Motorhome Summer Tyre Test +1.7 Different tests
Subj. Comfort Subj 20% #9/10 · 2020 Teknikens 17 Inch Summer Tyre Test 100% #1/7 · The Best Touring Tyres for 2025 Tested -80 Different tests
Tyre Weight Tyre 87% #6/10 · 2020 Teknikens 17 Inch Summer Tyre Test 74% #2/10 · 2020 Teknikens 17 Inch Summer Tyre Test +12.4 Same test
Wet Braking Wet 95% #5/10 · 2020 Teknikens 17 Inch Summer Tyre Test 94% #6/50 · 2023 ADAC Summer Tyre Test +1.4 Different tests
Wet Handling Wet 96% #4/10 · 2020 Teknikens 17 Inch Summer Tyre Test 97% #6/8 · 2023 Motor Summer Tyre Test -1.3 Different tests
From owners

Pros, cons & observations

Themes extracted from owner reviews across retailers and review sites — not the opinion of TireWheelGuide.

Tire A Kumho Solus HS51 Harmony Sports

The Kumho Solus HS51 Harmony Sports presents a polarizing experience, often praised for its comfort and value in general driving, yet criticized for significant handling instability in specific applications. While some users find them to be a superb mid-range upgrade, others report a disconcerting 'jelly-like' sidewall flex that severely compromises steering precision and dry grip.

Pros

  • High level of ride comfort and low noise levels
  • Excellent value for money compared to premium brands
  • Strong wet weather performance
  • Improved handling characteristics for van applications

Cons

  • Excessive sidewall softness leading to a 'wobbling' or unstable sensation
  • Noticeable decline in grip levels before the tread is fully worn
  • Inconsistent handling performance depending on axle placement
  • Limited durability under spirited driving conditions

Observations

  • Lightweight vehicles, such as the Mazda MX-5, appear particularly sensitive to the tire's soft sidewall, resulting in reported handling instability.
  • Users noted that the tire's performance characteristics are highly dependent on axle placement, with some experiencing 'dead' steering or lurching depending on front versus rear fitment.
  • The tire is reported to perform well in van applications, specifically benefiting from higher load and speed ratings compared to competitors.
Tire B Michelin Primacy 4

The Michelin Primacy 4 is widely regarded as a premium, long-lasting touring tire that excels in comfort, noise reduction, and consistent wet-weather performance. While it is highly praised for its longevity and safety, some enthusiasts find its handling 'floaty' or lacking in road feedback compared to sport-oriented tires, leading to a polarized experience depending on driving style.

Pros

  • Exceptional tread life and longevity
  • High levels of ride comfort and low road noise
  • Consistent performance even as the tire wears
  • Strong wet-weather grip and aquaplaning resistance

Cons

  • Vague steering feel and lack of road feedback
  • Soft sidewalls can feel 'mushy' or 'floaty' during spirited driving
  • High price point compared to competitors
  • Increased noise levels as the tire ages

Observations

  • Users with heavier vehicles or EVs often report a 'floaty' sensation, which some mitigate by increasing tire pressure.
  • Drivers of performance-oriented hatchbacks often find the tire's touring-focused design disappointing compared to UHP alternatives.
  • The tire is frequently noted for transforming the ride quality of vehicles previously fitted with harsh run-flat tires.
Community buzz

What real owners are saying

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

Tire A

Kumho Solus HS51 Harmony Sports

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

Tire B

Michelin Primacy 4

Positive

Community opinion on the Michelin Primacy 4 is largely positive, praising its exceptional wet braking capabilities, impressive longevity, low cabin noise, and smooth ride quality. While some users note limitations in heavy snow or rougher tarmac surfaces, it is widely recommended as a top-tier touring tire for daily driving compared to sportier alternatives like the Pilot Sport series.

r/i20nline_india ·21 upvotes ·2025-07-21

“Review: Michelin Primacy 4 ST I own a 2023 N8 DCT and recently changed all four tyres from the stock CEATs after one of the tyres’ sidewall was punctured on hitting a rather deep pothole at high speed. Cost: INR 9,750 per tyre Existing tyre buyback: INR 1,000 per tyre (~15k kms) Review: I’ve been using the new tyres for a few weeks now and I’m happy with the upgrade. The difference is noticeable, but only if you pay attention. I’d say a non-savvy person won’t notice anything different unless you ask them to pay attention. At low speeds, the road noise is reduced and the vehicle is noticeably silent (almost dead silent if the roads are smooth and the engine is at low revs) and smoother. At high speeds, the noise level difference is not very noticeable due to the engine and wind noise, but the smoothness and grip is noticeably better. That said, I wouldn’t say the stock tyres are bad (in terms of both - noise and grip) as a lot of reviewers like to point out; definitely not a night and day difference for me. Lastly, I believe the fuel efficiency has improved due to the lower rolling resistance, but I don’t have enough data to claim this confidently. My verdict is to only upgrade if your current tyres are worn out. Personally, I don’t think spending close to 40k is worth it for the budget conscious. But if you have the money to spare, you will definitely be happy with the upgrade. Read more”

r/AutomobileRO ·2 upvotes ·2025-09-22

“Am avut primacy 4 pe o electrica. Destul de dezamagit de faptul ca dupa ~ 28.000 km s-au tocit rau de au ajuns cam la 3 mm. Placute la condus, silentioase, dar nu cele mai aderente. Pilot sport 4 pe aceiasi electrica cu primacy 4. Huruie de te doare capul. Aderenta nu o simt neaparat wow fata de primacy 4. Nu le mai suport si abia astept sa le trec pe iarna, oricum asta fiind ultima incaltare cu ele. Pe o termica am primacy 5, si sunt cele mai ok din experienta mea. Cele mai silentioase si aderente din cele 3. Dupa 20.000 km uzura a scazut cam cu 1 mm. Recomandarea mea e sa alegi primacy 5 fara ezitare.”

r/nzev ·1 upvote ·2026-02-11

“Both our Polestar2 (new) and 2016 Leaf (Jap import) arrived with Primacy 4s on them. The FWD Polestar needed fronts replaced at ~35k km and being 245/45 R19s Primacy were too pricey so went with Kumho Ecsta PS71 equivalents for a lot cheaper and negligible difference in performance. The rears on the Polestar are still going strong at 45k km and look like at least 60k km will be likely. We also fitted Kumhos on our previous Leaf and were very satisfied with performance and life.”

r/nzev ·1 upvote ·2026-02-11

“When I bought my freshly imported 2014 Nissan Leaf in Sept 2020 it had 27,xxx km on the odometer and a full set of Michelin Primacy 4 that were sidewall dated from very late 2018, so likely only very low mileage on them. I put another 47,000km on them before replacing with a full set of Toyo Proxes C100 Plus in April 2024 which have also been great. The Michelin fronts were certainly very worn particularly the shoulders. I really rate Toyos so would encourage you to have a look. I’ve since put 21,000km on the Toyos and even after 12,500km, in May 2025 at their most recent WOF, the fronts still measured at 7mm and rears 8mm. P.S I paid $900 total for the 4 x Toyos inc. fitting, disposal etc.”

Top themes
#Wet braking and grip#Ride comfort and low noise#Tread wear and longevity#Comparison with Pilot Sport#Performance on EVs and hybrids

Based on 31 community posts

Specifications

Specs side by side

Attribute A · Kumho Solus HS51 Harmony Sports B · Michelin Primacy 4
CategorySummer Premium Touring tiresSummer Premium Touring tires
Vehicle typePassenger Car / CrossoverPassenger Car / Crossover
Final verdict

Which one should you actually buy?

Kumho

Michelin

Winner: Michelin Primacy 4 — better comfort, dry and handling. Pick the Kumho Solus HS51 Harmony Sports if wet matters most to you.

Pick tire B You want the most comfortable ride

Michelin Primacy 4 scores 77 vs 37 on comfort.

Pick tire B You want the most grip on dry roads

Michelin Primacy 4 scores 87 vs 72 on dry.

Pick tire B You enjoy sharp, responsive handling

Michelin Primacy 4 scores 77 vs 65 on handling.

Pick tire A Your priority is wet-weather safety

Kumho Solus HS51 Harmony Sports scores 86 vs 83 on wet.

Tire A · Kumho Solus HS51 Harmony Sports
Tire B · Michelin Primacy 4

How do we compare tires?

Every category score blends two independent signals. 60% comes from professional tire tests (braking distances, lap times, noise measurements) normalized against the best tire in each test and weighted toward recent tests. 40% comes from thousands of owner reviews collected from retailers and review sites. When a tire has only one of the two, we use what exists and say so.

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