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 Kumho Solus KL21 — Compared
Relative Score (0–100): the weighted average of the categories below, each 60% road tests and 40% owner reviews. Based on 1 + 0 road tests and 5 + 14 owner reviews. How we score
Solus HS51 Harmony Sports is ahead, 67–57
Add your size for an exact match
/R
Both Amazon links then search this exact size.
TireWheelGuide may earn a commission from purchases made through these links.
Tests – · none yet Owners 51 · 14 reviews
Category by category
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
-
66
Dry
Solus HS51 Harmony Sports +1155Why this score
Source Solus HS51 Harmony Sports Solus KL21 Professional tests (TWG score) · 1 / – tests 65 ≈ 60 (est.) Reviews found online 66 48 Solus HS51 Harmony Sports: 60% × 65.4 + 40% × 65.8 = 66
Solus KL21: 60% × 59.9 (est.) + 40% × 48.2 = 55
No road tests of dry for Solus KL21. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.40).
-
73
Wet
Solus HS51 Harmony Sports +1459Why this score
Source Solus HS51 Harmony Sports Solus KL21 Professional tests (TWG score) · 1 / – tests 75 ≈ 62 (est.) Reviews found online 70 56 Solus HS51 Harmony Sports: 60% × 75.3 + 40% × 70.4 = 73
Solus KL21: 60% × 61.8 (est.) + 40% × 55.5 = 59
No road tests of wet for Solus KL21. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.56).
-
–
Snow
No comparison54Why this score
Source Solus HS51 Harmony Sports Solus KL21 Professional tests (TWG score) – ≈ 61 (est.) Reviews found online – 43 Solus KL21: 60% × 61 (est.) + 40% × 43 = 54
No road tests of snow for Solus KL21. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.33).
-
59
Comfort
Level59Why this score
Source Solus HS51 Harmony Sports Solus KL21 Professional tests (TWG score) · 1 / – tests 51 ≈ 66 (est.) Reviews found online 71 49 Solus HS51 Harmony Sports: 60% × 51 + 40% × 70.7 = 59
Solus KL21: 60% × 65.7 (est.) + 40% × 49.1 = 59
No road tests of comfort for Solus KL21. The test half is the tested tires’ average (69): owners’ comfort ratings barely follow the road tests.
-
66
Treadwear
Solus HS51 Harmony Sports +759Why this score
Source Solus HS51 Harmony Sports Solus KL21 Professional tests (TWG score) ≈ 66 (est.) ≈ 62 (est.) Reviews found online 66 55 Solus HS51 Harmony Sports: 60% × 65.7 (est.) + 40% × 65.9 = 66
Solus KL21: 60% × 62.4 (est.) + 40% × 55 = 59
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).
No road tests of treadwear for Solus KL21. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.31).
-
61
Handling (owners)
Solus HS51 Harmony Sports +1249Why this score
Source Solus HS51 Harmony Sports Solus KL21 Reviews found online 61 49
Scores at a glance
| Category | Kumho Solus HS51 Harmony Sports | Kumho Solus KL21 |
|---|---|---|
| Relative Score | 67 | 57 |
| Dry | 66 | 55 |
| Wet | 73 | 59 |
| Snow | – | 54 |
| Comfort | 59 | 59 |
| Treadwear | 66 | 59 |
| Handling (owners) | 61 | 49 |
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
Neutral
NotLessNeutralImportantMost
Only one of the two tires has a score here, so this weight changes nothing in the head-to-head.
Less important
NotLessNeutralImportantMost
Neutral
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Recomputed
Headline score
67
/ 100
Solus HS51 Harmony Sports
57
/ 100
Solus KL21
Only categories both tires have data for count toward the headline score.
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 Solus KL21
Pros
- Impressive treadwear and longevity reported by many users, with several achieving over 30,000 to 40,000 miles
- Good ride comfort and low road noise under normal driving conditions
- Affordable replacement pricing compared to premium tier brands
Cons
- Extremely poor grip and significantly increased braking distances on fresh or compact snow and ice
- Isolated reports of extreme premature wear or complete tread failure under 20,000 miles
- Structural deformation issues reported by at least one user
Specs side by side
| Attribute | A · Kumho Solus HS51 Harmony Sports | B · Kumho Solus KL21 |
|---|---|---|
| Category | Summer | All Season |
| Vehicle type | Passenger Car / Crossover | Passenger Car / Crossover |
| Sizes available | — | 5 |
| Rim diameters | — | 17″ – 20″ |
Which one should you actually buy?
67
/ 100
Kumho Solus HS51 Harmony Sports
57
/ 100
Kumho Solus KL21
Winner: Kumho Solus HS51 Harmony Sports — better wet, handling and dry. 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. Kumho Solus KL21 rests on little evidence so far (0 tests, 14 reviews), so read this result as provisional.
Pick tire A
Your priority is wet-weather safety
Kumho Solus HS51 Harmony Sports scores 73 vs 59 on wet.
Pick tire A
You enjoy sharp, responsive handling
Kumho Solus HS51 Harmony Sports scores 61 vs 49 on handling.
Pick tire A
You want the most grip on dry roads
Kumho Solus HS51 Harmony Sports scores 66 vs 55 on dry.
Pick tire A
You want the longest tread life
Kumho Solus HS51 Harmony Sports scores 66 vs 59 on treadwear.
Tire A · Kumho Solus HS51 Harmony Sports
Tire B · Kumho Solus KL21
TireWheelGuide may earn a commission from purchases made through these links.
Solus HS51 Harmony Sports or Solus KL21?
Which is better in the wet, Solus HS51 Harmony Sports or Solus KL21?
Kumho Solus HS51 Harmony Sports, 73 vs 59 on our wet score.
Which grips better on dry roads, Solus HS51 Harmony Sports or Solus KL21?
Kumho Solus HS51 Harmony Sports, 66 vs 55 on our dry score.
Which is more comfortable, Solus HS51 Harmony Sports or Solus KL21?
Neither, by our numbers: 59 vs 59 on the comfort score, within 3 points.
Which lasts longer, Solus HS51 Harmony Sports or Solus KL21?
Kumho Solus HS51 Harmony Sports, 66 vs 59 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