71
/ 100
Objective (60%)
63/100
1 professional test
User signal (40%)
76/100
5 owner reviews
Prices change daily — check the retailer for your size.
Head-to-head
Updated September 2026
Kumho Solus HS51 Harmony Sports vs Kumho Solus KL21 — 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.
VS
76
/ 100
Objective (60%)
–/100
No test data yet
User signal (40%)
76/100
26 owner reviews
Prices change daily — check the retailer for your size.
VerdictWinner: Kumho Solus KL21 — better comfort and dry. Pick the Kumho Solus HS51 Harmony Sports if wet and handling matter most to you.
Read full
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Category breakdown
7 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
Score (0–100)
Solus KL21 leads by 11
Why this score
| Source | Solus HS51 Harmony Sports | Solus KL21 |
|---|---|---|
| Professional tests (TWG score) | 63 | – |
| Tire Rack owners | – | 79 |
| Tyre Reviews owners | 85 | 73 |
Wet
Score (0–100)
Solus HS51 Harmony Sports leads by 10
Why this score
| Source | Solus HS51 Harmony Sports | Solus KL21 |
|---|---|---|
| Professional tests (TWG score) | 90 | – |
| Tire Rack owners | – | 71 |
| Tyre Reviews owners | 80 | 67 |
Snow
Score (0–100)
Why this score
| Source | Solus HS51 Harmony Sports | Solus KL21 |
|---|---|---|
| Tire Rack owners | – | 45 |
Comfort
Score (0–100)
Solus KL21 leads by 39
Why this score
| Source | Solus HS51 Harmony Sports | Solus KL21 |
|---|---|---|
| Professional tests (TWG score) | 1 | – |
| Tire Rack owners | – | 73 |
| Tyre Reviews owners | 90 | 65 |
Noise
Score (0–100)
Treadwear
Score (0–100)
Solus KL21 leads by 1
Why this score
| Source | Solus HS51 Harmony Sports | Solus KL21 |
|---|---|---|
| Tire Rack owners | – | 63 |
| Tyre Reviews owners | 80 | 73 |
Handling
Score (0–100)
Solus HS51 Harmony Sports leads by 4
Why this score
| Source | Solus HS51 Harmony Sports | Solus KL21 |
|---|---|---|
| Tyre Reviews owners | 65 | 61 |
Scores at a glance
| Category | Kumho Solus HS51 Harmony Sports | Kumho Solus KL21 |
|---|---|---|
| Relative Score | 71 | 76 |
| Dry | 72 | 83 |
| Wet | 86 | 76 |
| Snow | – | 72 |
| Comfort | 37 | 76 |
| Noise | – | 86 |
| Treadwear | 80 | 81 |
| Handling | 65 | 61 |
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
71
/ 100
Tire A
76
/ 100
Tire B
Only categories both tires have data for count toward the headline score.
From owners
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 Kumho Solus KL21 is a polarizing tire that frequently serves as original equipment on SUVs and crossovers. While many owners report exceptional tread life and value, a significant subset of users expresses concerns regarding road noise, inconsistent grip in adverse weather, and premature structural degradation.
Pros
- Exceptional tread longevity and durability, with some users reporting over 60,000 miles of use.
- Strong value proposition as a cost-effective alternative to premium tire brands.
- Generally reliable performance in dry, warm-weather conditions.
- Consistent ride comfort for daily commuting and long-distance driving.
Cons
- Reports of excessive road noise and a harsh ride quality.
- Poor traction and braking performance in snow, ice, or cold conditions.
- Inconsistent quality control, with isolated reports of tire deformation or premature wear.
- Lack of confidence-inspiring grip during emergency braking maneuvers.
Observations
- Users with mid-size SUVs like the Hyundai Santa Fe and Kia Sorento report highly variable experiences, ranging from extreme longevity to early failure.
- The tire is frequently noted as a standard OEM fitment for Korean-manufactured SUVs, which influences user expectations regarding replacement intervals.
Specifications
Specs side by side
| Attribute | A · Kumho Solus HS51 Harmony Sports | B · Kumho Solus KL21 |
|---|---|---|
| Category | Summer Premium Touring tires | All Season Touring tires |
| Vehicle type | Passenger Car / Crossover | Passenger Car / Crossover |
Final verdict
Which one should you actually buy?
71
/ 100
Kumho
76
/ 100
Kumho
Winner: Kumho Solus KL21 — better comfort and dry. Pick the Kumho Solus HS51 Harmony Sports if wet and handling matter most to you.
Pick tire B
You want the most comfortable ride
Kumho Solus KL21 scores 76 vs 37 on comfort.
Pick tire B
You want the most grip on dry roads
Kumho Solus KL21 scores 83 vs 72 on dry.
Pick tire A
Your priority is wet-weather safety
Kumho Solus HS51 Harmony Sports scores 86 vs 76 on wet.
Pick tire A
You enjoy sharp, responsive handling
Kumho Solus HS51 Harmony Sports scores 65 vs 61 on handling.
Tire A · Kumho Solus HS51 Harmony Sports
Tire B · Kumho Solus KL21
More comparisons
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Kumho Solus KL21 also compared with
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.