Tests 68 · 1 test Owners 67 · 5 reviews
Best test result: #1 of 10 in 2020 Teknikens 17 Inch Summer Tyre Test (straight aquaplaning)
Kumho Solus HS51 Harmony Sports looks discontinued: no new owner reviews or road tests in five years and no current EU tyre label.
Head-to-head
Updated
Kumho Solus HS51 Harmony Sports vs Michelin Primacy 4 — Compared
Relative Score (0–100): the weighted average of the categories below, each 60% road tests and 40% owner reviews. Based on 1 + 23 road tests and 5 + 13,381 owner reviews. How we score
Primacy 4 is ahead, 79–67
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Tests 83 · 23 tests Owners 74 · 13,381 reviews
Best test result: #1 of 20 in 2020 Auto Zeitung Summer Tyre Test (wet braking)
“Well my answer is none of the above. You choose, they are all a lottery imo. I just bought some Michelin Primacy 4 for mine today. Size 215/55 R18”
Category by category
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
-
66
Dry
Primacy 4 +1581Why this score
Source Solus HS51 Harmony Sports Primacy 4 Professional tests (TWG score) · 1 / 21 tests 65 85 Reviews found online 66 74 Dry Braking (% of best) · 1 shared test · wins 0–1 91% 100% Solus HS51 Harmony Sports: 60% × 65.4 + 40% × 65.8 = 66
Primacy 4: 60% × 85.3 + 40% × 73.9 = 81
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73
Wet
Primacy 4 +881Why this score
Source Solus HS51 Harmony Sports Primacy 4 Professional tests (TWG score) · 1 / 22 tests 75 85 Reviews found online 70 76 Straight Aquaplaning (% of best) · 1 shared test · wins 1–0 100% 94% Wet Braking (% of best) · 1 shared test · wins 1–0 95% 92% Wet Handling (% of best) · 1 shared test · wins 0–1 99% 100% Solus HS51 Harmony Sports: 60% × 75.3 + 40% × 70.4 = 73
Primacy 4: 60% × 84.9 + 40% × 76.2 = 81
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59
Comfort
Primacy 4 +1776Why this score
Source Solus HS51 Harmony Sports Primacy 4 Professional tests (TWG score) · 1 / 5 tests 51 76 Reviews found online 71 74 Comfort (tester's mark) (% of best) · 1 shared test · wins 0–1 20% 100% Solus HS51 Harmony Sports: 60% × 51 + 40% × 70.7 = 59
Primacy 4: 60% × 76.5 + 40% × 74.2 = 76
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–
Noise
No comparison71Why this score
Source Solus HS51 Harmony Sports Primacy 4 Professional tests (TWG score) · – / 15 tests – 74 Reviews found online – ≈ 67 (est.) Primacy 4: 60% × 73.6 + 40% × 67.3 (est.) = 71
No owner ratings of noise for Primacy 4. The owner half is the owners’ average (67): owners’ noise ratings barely follow the road tests, so the tests say nothing about how owners would rate it.
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66
Treadwear
Primacy 4 +1177Why this score
Source Solus HS51 Harmony Sports Primacy 4 Professional tests (TWG score) · – / 3 tests ≈ 66 (est.) 82 Reviews found online 66 71 Solus HS51 Harmony Sports: 60% × 65.7 (est.) + 40% × 65.9 = 66
Primacy 4: 60% × 81.7 + 40% × 70.6 = 77
No road tests of treadwear for Solus HS51 Harmony Sports. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.31).
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61
Handling (owners)
Primacy 4 +1374Why this score
Source Solus HS51 Harmony Sports Primacy 4 Reviews found online 61 74
Scores at a glance
| Category | Kumho Solus HS51 Harmony Sports | Michelin Primacy 4 |
|---|---|---|
| Relative Score | 67 | 79 |
| Dry | 66 | 81 |
| Wet | 73 | 81 |
| Comfort | 59 | 76 |
| Noise | – | 71 |
| Treadwear | 66 | 77 |
| Handling (owners) | 61 | 74 |
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
Less important
NotLessNeutralImportantMost
Only one of the two tires has a score here, so this weight changes nothing in the head-to-head.
Neutral
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Recomputed
Headline score
67
/ 100
Solus HS51 Harmony Sports
79
/ 100
Primacy 4
Only categories both tires have data for count toward the headline score.
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.
In the overall rankings of 1 tests that ran both, Kumho Solus HS51 Harmony Sports finished ahead 0 times and Michelin Primacy 4 1 times.
| Discipline | Category | Solus HS51 Harmony Sports | Primacy 4 | Δ | Head-to-head |
|---|---|---|---|---|---|
| Dry Braking | Dry | 91% | 100% | −8.6 | 0–1 in 1 shared test Newest: 2020 Teknikens 17 Inch Summer Tyre Test · 225/50 R17 |
| Straight Aquaplaning | Wet | 100% | 94% | +6.4 | 1–0 in 1 shared test Newest: 2020 Teknikens 17 Inch Summer Tyre Test · 225/50 R17 |
| Wet Braking | Wet | 95% | 92% | +3.2 | 1–0 in 1 shared test Newest: 2020 Teknikens 17 Inch Summer Tyre Test · 225/50 R17 |
| Wet Handling | Wet | 99% | 100% | −1.1 | 0–1 in 1 shared test Newest: 2020 Teknikens 17 Inch Summer Tyre Test · 225/50 R17 |
| Comfort (tester's mark) | Comfort | 20% | 100% | −80.0 | 0–1 in 1 shared test Newest: 2020 Teknikens 17 Inch Summer Tyre Test · 225/50 R17 |
| Also published by the testers (not in the score) | |||||
| Rolling Resistance | Efficiency | 94% | 99% | −5.2 | 0–1 in 1 shared test Newest: 2020 Teknikens 17 Inch Summer Tyre Test · 225/50 R17 |
| Tyre Weight | Other | 86% | 100% | −14.3 | 0–1 in 1 shared test Newest: 2020 Teknikens 17 Inch Summer Tyre Test · 225/50 R17 |
| Overall Ranking | Overall | #7/10 | #1/10 | – | 0–1 in 1 shared test Newest: 2020 Teknikens 17 Inch Summer Tyre Test · 225/50 R17 |
Pros, cons & observations
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
Tire A Solus HS51 Harmony Sports
Pros
- High level of ride comfort and low noise levels
- Excellent value for money compared to premium brands
- Strong wet weather performance
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
Tire B Primacy 4
Pros
- Exceptional tread life and long-lasting durability
- Low road noise and a very quiet, comfortable ride
- Reliable and consistent wet and dry grip
Cons
- Vague, numb, or floaty steering feel with soft sidewalls under hard cornering
- High price point compared to competitors
- Occasional reports of increased road noise or harsher ride as the tread wears down
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
Positive
Michelin Primacy 4
Community sentiment towards the Michelin Primacy 4 is generally positive, with drivers frequently praising its quiet ride, comfort, and dependable wet and dry braking performance. Several owners note impressive longevity reaching over 50,000 to 70,000 km, though some EV and SUV drivers report accelerated wear and fragile sidewalls over rough terrain. It is commonly viewed as a premium touring tire that commands high prices compared to competitors.
mustang6g.com
·2022-12-14
“I have used Michelin tires before but recently I already have used Nankang tires. I compared Michelin and Nankang tires after testing. It was quite a pleasant surprise that the Nankang AS1 was nearly on par with the Michelin Primacy 4 in braking distance. Both tires performed exceptionally well, with the Primacy 4 only stopping slightly 3 meters shorter than the AS1.”
r/SubaruForester
·2026-09-11
“Rapid wear on Michelin Primacy 4, 2017 Forester 2017 Forester in Mexico City, where there are lots of potholes and speed bumps and a LOT of rain. I got a set of Michelin Primacy 4+ tires at Costco three years ago and they've got about 30,000 kms -- 16,000 miles on them. Tread is down to about 3.5/32nds (in the middle, slightly less at the sides). The original Geolandars lasted very far beyond that in the same conditions. I'm getting a bit antsy at the tread depth. Wonder if anybody else has seen such rapid wear.”
qashqaiforums.co.uk
·2022-06-03
“Well my answer is none of the above. You choose, they are all a lottery imo. I just bought some Michelin Primacy 4 for mine today. Size 215/55 R18”
Top themes
#tread life and longevity#cabin noise and comfort#wet and dry grip#comparisons with Pilot Sport#EV tire performance#sidewall damage and punctures#premium pricing
Based on 44 community posts
Specs side by side
| Attribute | A · Kumho Solus HS51 Harmony Sports | B · Michelin Primacy 4 |
|---|---|---|
| Category | Summer | Summer |
| Vehicle type | Passenger Car / Crossover | Passenger Car / Crossover |
| Sizes available | — | 57 |
| Rim diameters | — | 15″ – 20″ |
Which one should you actually buy?
67
/ 100
Kumho Solus HS51 Harmony Sports
79
/ 100
Michelin Primacy 4
Winner: Michelin Primacy 4 — better comfort, dry and handling. It leads or ties in every category we score. Kumho Solus HS51 Harmony Sports rests on little evidence so far (1 test, 5 reviews), so read this result as provisional.
Pick tire B
You want the most comfortable ride
Michelin Primacy 4 scores 76 vs 59 on comfort.
Pick tire B
You want the most grip on dry roads
Michelin Primacy 4 scores 81 vs 66 on dry.
Pick tire B
You enjoy sharp, responsive handling
Michelin Primacy 4 scores 74 vs 61 on handling.
Pick tire B
You want the longest tread life
Michelin Primacy 4 scores 77 vs 66 on treadwear.
Tire A · Kumho Solus HS51 Harmony Sports
Tire B · Michelin Primacy 4
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Solus HS51 Harmony Sports or Primacy 4?
Which is better in the wet, Solus HS51 Harmony Sports or Primacy 4?
Michelin Primacy 4, 81 vs 73 on our wet score.
Which grips better on dry roads, Solus HS51 Harmony Sports or Primacy 4?
Michelin Primacy 4, 81 vs 66 on our dry score.
Which is more comfortable, Solus HS51 Harmony Sports or Primacy 4?
Michelin Primacy 4, 76 vs 59 on our comfort score.
Which lasts longer, Solus HS51 Harmony Sports or Primacy 4?
Michelin Primacy 4, 77 vs 66 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