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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.
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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
Why this score
| Source | Solus HS51 Harmony Sports | Primacy 4 |
|---|---|---|
| Professional tests (TWG score) | 63 | 88 |
| Tyre Reviews owners | 85 | 85 |
| Dry Braking (% of best) | 91% | 97% |
Wet
Why this score
| Source | Solus HS51 Harmony Sports | Primacy 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
Why this score
| Source | Solus HS51 Harmony Sports | Primacy 4 |
|---|---|---|
| Professional tests (TWG score) | 1 | 74 |
| Tyre Reviews owners | 90 | 83 |
Noise
Why this score
| Source | Solus HS51 Harmony Sports | Primacy 4 |
|---|---|---|
| Professional tests (TWG score) | – | 75 |
Treadwear
Why this score
| Source | Solus HS51 Harmony Sports | Primacy 4 |
|---|---|---|
| Tyre Reviews owners | 80 | 82 |
Handling
Why this score
| Source | Solus HS51 Harmony Sports | Primacy 4 |
|---|---|---|
| Tyre Reviews owners | 65 | 77 |
| DriverReviews owners | – | 86 |
Scores at a glance
| Category | Kumho Solus HS51 Harmony Sports | Michelin 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.
Weight the categories that matter to you
Wet grip and treadwear start at “Important” — the two things buyers rank highest. Move the sliders and the scores update instantly.
Tire A
Tire B
Only categories both tires have data for count toward the headline score.
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.
| Discipline | Category | Tire A | Tire B | Δ | Both? |
|---|---|---|---|---|---|
| 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 |
Pros, cons & observations
Themes extracted from owner reviews across retailers and review sites — not the opinion of TireWheelGuide.
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.
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.
What real owners are saying
From Reddit, forums and review threads. Not part of our score
Kumho Solus HS51 Harmony Sports
We haven't collected enough community discussion about this tire yet.
Michelin Primacy 4
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.
“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”
“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.”
“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.”
“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.”
Based on 31 community posts
Specs side by side
| Attribute | A · Kumho Solus HS51 Harmony Sports | B · Michelin Primacy 4 |
|---|---|---|
| Category | Summer Premium Touring tires | Summer Premium Touring tires |
| Vehicle type | Passenger Car / Crossover | Passenger Car / Crossover |
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.
Michelin Primacy 4 scores 77 vs 37 on comfort.
Michelin Primacy 4 scores 87 vs 72 on dry.
Michelin Primacy 4 scores 77 vs 65 on handling.
Kumho Solus HS51 Harmony Sports scores 86 vs 83 on wet.
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.