Tests – · none yet Owners 60 · 5 reviews
Kumho Solus Vier KH21 looks discontinued: no new owner reviews or road tests in five years and no current EU tyre label.
Head-to-head
Updated
Kumho Solus Vier KH21 vs Vredestein Quatrac Pro — Compared
Relative Score (0–100): the weighted average of the categories below, each 60% road tests and 40% owner reviews. Based on 0 + 14 road tests and 5 + 588 owner reviews. How we score
Quatrac Pro is ahead, 75–65
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Tests 68 · 14 tests Owners 74 · 588 reviews
Best test result: #1 of 16 in 2021 Auto Bild All Season Tyre Test (wet braking)
Category by category
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
-
66
Dry
Quatrac Pro +874Why this score
Source Solus Vier KH21 Quatrac Pro Professional tests (TWG score) · – / 13 tests ≈ 66 (est.) 73 Reviews found online 65 75 Solus Vier KH21: 60% × 66.5 (est.) + 40% × 64.6 = 66
Quatrac Pro: 60% × 72.6 + 40% × 75.1 = 74
No road tests of dry for Solus Vier KH21. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.40).
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71
Wet
Quatrac Pro +1283Why this score
Source Solus Vier KH21 Quatrac Pro Professional tests (TWG score) · – / 13 tests ≈ 70 (est.) 84 Reviews found online 71 80 Solus Vier KH21: 60% × 70.4 (est.) + 40% × 70.9 = 71
Quatrac Pro: 60% × 84.2 + 40% × 80 = 83
No road tests of wet for Solus Vier KH21. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.56).
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–
Snow
No comparison55Why this score
Source Solus Vier KH21 Quatrac Pro Professional tests (TWG score) · – / 11 tests – 48 Reviews found online – 66 Quatrac Pro: 60% × 48.4 + 40% × 65.8 = 55
-
62
Comfort
Quatrac Pro +1375Why this score
Source Solus Vier KH21 Quatrac Pro Professional tests (TWG score) · – / 1 tests ≈ 67 (est.) 73 Reviews found online 54 77 Solus Vier KH21: 60% × 66.5 (est.) + 40% × 54.1 = 62
Quatrac Pro: 60% × 72.9 + 40% × 77.2 = 75
No road tests of comfort for Solus Vier KH21. The test half is the tested tires’ average (69): owners’ comfort ratings barely follow the road tests.
-
–
Noise
No comparison75Why this score
Source Solus Vier KH21 Quatrac Pro Professional tests (TWG score) · – / 10 tests – 75 Reviews found online – 74 Quatrac Pro: 60% × 75.4 + 40% × 73.6 = 75
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55
Treadwear
Quatrac Pro +661Why this score
Source Solus Vier KH21 Quatrac Pro Professional tests (TWG score) · – / 2 tests ≈ 60 (est.) 55 Reviews found online 47 69 Solus Vier KH21: 60% × 59.8 (est.) + 40% × 46.6 = 55
Quatrac Pro: 60% × 54.9 + 40% × 69.2 = 61
No road tests of treadwear for Solus Vier KH21. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.31).
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65
Handling (owners)
Quatrac Pro +974Why this score
Source Solus Vier KH21 Quatrac Pro Reviews found online 65 74
Scores at a glance
| Category | Kumho Solus Vier KH21 | Vredestein Quatrac Pro |
|---|---|---|
| Relative Score | 65 | 75 |
| Dry | 66 | 74 |
| Wet | 71 | 83 |
| Snow | – | 55 |
| Comfort | 62 | 75 |
| Noise | – | 75 |
| Treadwear | 55 | 61 |
| Handling (owners) | 65 | 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
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
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
65
/ 100
Solus Vier KH21
75
/ 100
Quatrac Pro
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.
| Discipline | Category | Solus Vier KH21 | Quatrac Pro | Δ | Head-to-head |
|---|---|---|---|---|---|
| Also published by the testers (not in the score) | |||||
| Overall Ranking | Overall | #9/9 2011 Auto Express Winter Tyre Test | #9/11 2024 Sports Car All Season Tyre Test | – | Different tests |
Pros, cons & observations
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
Tire A Solus Vier KH21
Pros
- Cost-effective pricing compared to premium alternatives
- Certified for winter use with the mountain and snowflake symbol
- Reliable grip and handling characteristics when tires are new
Cons
- Rapid and uneven tread wear, particularly on front axles
- Increased road noise and reduced comfort as the rubber compound hardens over time
- Susceptibility to balancing issues and structural deformation
Tire B Quatrac Pro
Pros
- Exceptional wet weather performance with high resistance to aquaplaning
- Remarkably low road noise and high ride comfort compared to OEM or run-flat tires
- Strong and predictable grip in cold, rainy, and mild winter conditions
Cons
- Reduced fuel economy or slight negative impact on range reported by some users
- Mixed feedback on durability, with a few drivers experiencing faster-than-expected tread wear or manufacturing defects
- Subpar performance in heavy snow or packed ice compared to dedicated winter tires
Specs side by side
| Attribute | A · Kumho Solus Vier KH21 | B · Vredestein Quatrac Pro |
|---|---|---|
| Category | All Season | All Season |
| Vehicle type | Passenger Car / Crossover | Passenger Car / Crossover |
| Sizes available | — | 97 |
| Rim diameters | — | 17″ – 22″ |
Which one should you actually buy?
65
/ 100
Kumho Solus Vier KH21
75
/ 100
Vredestein Quatrac Pro
Winner: Vredestein Quatrac Pro — better comfort, wet and handling. It leads or ties in every category we score. Kumho Solus Vier KH21 rests on little evidence so far (0 tests, 5 reviews), so read this result as provisional.
Pick tire B
You want the most comfortable ride
Vredestein Quatrac Pro scores 75 vs 62 on comfort.
Pick tire B
Your priority is wet-weather safety
Vredestein Quatrac Pro scores 83 vs 71 on wet.
Pick tire B
You enjoy sharp, responsive handling
Vredestein Quatrac Pro scores 74 vs 65 on handling.
Pick tire B
You want the most grip on dry roads
Vredestein Quatrac Pro scores 74 vs 66 on dry.
Tire A · Kumho Solus Vier KH21
Tire B · Vredestein Quatrac Pro
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Solus Vier KH21 or Quatrac Pro?
Which is better in the wet, Solus Vier KH21 or Quatrac Pro?
Vredestein Quatrac Pro, 83 vs 71 on our wet score.
Which grips better on dry roads, Solus Vier KH21 or Quatrac Pro?
Vredestein Quatrac Pro, 74 vs 66 on our dry score.
Which is more comfortable, Solus Vier KH21 or Quatrac Pro?
Vredestein Quatrac Pro, 75 vs 62 on our comfort score.
Which lasts longer, Solus Vier KH21 or Quatrac Pro?
Vredestein Quatrac Pro, 61 vs 55 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