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Kumho Solus Vier KH21 View Gallery (1)
145-225/50-65 R13-16 7 sizes 2009 Winter rated

Kumho Solus Vier KH21

Kumho Tires Touring All Season

The Kumho Solus Vier KH21 is a Touring All Season tire designed to be fitted to Passenger Cars.

6.3
Tire Reviews Score Based on User Reviews
Limited Confidence View Breakdown
Dry Grip
83%
Wet Grip
85%
Road Feedback
80%
Handling
78%
Wear
53%
Comfort
60%
Buy again
63%
5 Reviews
72% Average
55,000 miles driven
2 Tests (avg: 9th)
Kumho Solus Vier KH21

Kumho Solus Vier KH21

All Season Mid-Range
BETA
6.3 / 10
Based on User Reviews · Limited Confidence · Updated 23 Feb 2026

The Tire Reviews Score is the most comprehensive tire scoring system available. It aggregates professional test data from multiple independent publications, user reviews, and consistency analysis using Bayesian statistical methods, weighted normalisation, and recency-adjusted scoring to produce a single, reliable performance rating.

Learn more about our methodology
Score Components
Professional Tests
Weight: 80%
Tests: 2
Publications: 2
Period: 2011
User Reviews
Weight: 15%
Reviews: 5
Avg Rating: 71.5%
Min Required: 5
Consistency
Weight: 5%
Score Std Dev: 2.52
History Points: 10
Methodology & Configuration
Scoring Process
  1. Collect Test Data: Gather results from professional tire tests across multiple publications. Minimum 1 test(s) required.
  2. Normalize Positions: Convert test positions to percentile scores using exponential weighting (factor: 1.2).
  3. Apply Recency Weighting: More recent tests are weighted higher with a decay rate of 0.95.
  4. Incorporate User Reviews: Factor in user review data (minimum 5 reviews). Weight: 15%.
  5. Bayesian Smoothing: Apply Bayesian prior (score: 7, weight: 1.5) to prevent extreme scores with limited data.
  6. Calculate Final Score: Combine all components using normalization factor of 1.1. Max score with limited data: 9.5.
Component Weights
Test Data
80%
User Reviews
15%
Consistency
5%
All Configuration Parameters
ParameterValueDescription
safety_weight 0.7 Weight multiplier for safety-related metrics
performance_weight 0.55 Weight multiplier for performance metrics
comfort_weight 0.4 Weight multiplier for comfort metrics
value_weight 0.45 Weight multiplier for value-for-money metrics
user_reviews_weight 0.15 How much user reviews contribute to the final score
test_data_weight 0.8 How much professional test data contributes to the final score
consistency_weight 0.05 How much score consistency contributes to the final score
recency_decay_rate 0.95 Rate at which older test results lose influence (higher = slower decay)
min_test_count 1 Minimum number of professional tests required
min_review_count 5 Minimum number of user reviews required
score_version 1.9 Current version of the scoring algorithm
score_normalization_factor 1.1 Factor used to normalize raw scores to the 0-10 scale
confidence_factor_weight 0.2 How much data confidence affects the final score
position_penalty_weight 0.2 Penalty applied for poor test positions
gap_penalty_threshold 12 Score gap (%) that triggers additional penalties
min_metrics_count 2 Minimum number of test metrics needed per test
limited_data_threshold 2 Number of tests below which data is considered limited
single_test_penalty 0.75 Score multiplier when only one test is available
critical_metric_penalty 0.7 Penalty for poor performance on critical safety metrics
critical_metric_threshold 70 Score below which a critical metric penalty applies
position_exponential_factor 1.2 Exponent used to amplify position-based scoring
position_exponential_threshold 0.9 Position percentile below which exponential scoring applies
gap_multiplier_critical 3 Multiplier for critical gap penalties
max_category_weight 2 Maximum weight any single category can have
max_score_limited_data 9.5 Score cap when data is limited
bayesian_prior_weight 1.5 Weight of the Bayesian prior in smoothing
bayesian_prior_score 7 Prior score used for Bayesian smoothing
evidence_test_multiplier 1.9 Multiplier for test evidence in confidence calculation
evidence_metric_divisor 3 Divisor for metric count in evidence calculation
evidence_review_divisor 10 Divisor for review count in evidence calculation
combined_penalty_floor 0.2
Data Sources
TestPublicationDateSizePositionMetrics
2011 EVO Winter Tire Test EVO 2011 225/45 R17 9/10 0 metrics
2011 Auto Express Winter Tire Test Auto Express 2011 225/45 R17 8/9 0 metrics
All Tests
View Test Results
2
Tests
9th
Average
8th
Best
9th
Worst
Latest Tire Test Results
2011 EVO Winter Tire Test
225/45 R17 • 2011
9th/10
2011 Auto Express Winter Tire Test
225/45 R17 • 2011
8th/9
The all season tire that fails to shine in any conditions!
View Test Results
Size Fuel Wet Noise
13 inch
165/65R13 77 T D D 70
14 inch
195/60R14 86 H C C 71
15 inch
145/65R15 72 T D C 70
15C inch
205/65R15C 102/100 T D C 72
16 inch
225/50R16 92 V C C 71
205/50R16 87 V D C 71
16C inch
215/65R16C 109/107 T D C 72
View All Sizes and EU Label Scores for the Kumho Solus Vier KH21 >>

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Top 3 Kumho Solus Vier KH21 Reviews

Given 71% while driving a Citroën XM V6 24 valve 3 litre series 2 (205/65 R15 V) on a combination of roads for 25,000 average miles
has been in use three years, front tires wear much more and need to change, rear still good. After two years tires become hard, more noisy. This month changed them all to conti TS850 - difference is huge especialy in comfort, fellings like I get another higher class of my car.
Helpful 528
December 22, 2013
Given 59% while driving a Volkswagen Passat 1.9Tdi (205/60 R15 H) on a combination of roads for 15,000 average miles
I have had 4 of these tires on my Passat estate initially they felt good when new but as they wore down a bit I had all sorts of problems,firstly the front tires wore very badly on the outside and inside edges more so on the nearside and the balance was very bad by the time I changed them. On the rear again the nearside one went out of shape and had high and low area's on the inside edge also the balance was way out and it was causing a lot of strange sounds that I thought were mechanical I also tried the nearside rear on the front and the sound I got was just like a wheel bearing had gone in fact the noise was so bad all the way to Heathrow that on the way back I had to put the spare on"all noise gone" The remaing tire on the rear offside is still fitted but is showing signs of going out of shape I mean that by jacking up the car and spinning the wheel I can see the tread rising up and down.Tomorrow I am having two more Hancook's fitted to the read to match the fronts and will see how that goes.
Helpful 499
September 18, 2012
Given 76% while driving a Opel Astra G 1.6 (195/60 R15 H) on a combination of roads for 4,000 average miles
The tires are very sensitive of the air temperature and atmospheric pressure. It always depends on the current weather condition how much they keep their pressure, so it's recommended to have a hand pump in the trunk just in case...
Helpful 525
July 8, 2011

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Latest Kumho Solus Vier KH21 Reviews

Given 85% while driving a Citroën berlingo (175/70 R14) on a combination of roads for 1,000 spirited miles
I drive in europe often, and wanted an all season tire which had to comply with my list of specs. It had to have the mountain and snowflake symbol for winter, to fully comply with winter tire laws in europe. Have good grip and road handling all year. Very pleased with tire. worth every penny. I have slung the car around in the dry and in heavy rain to find its maximum traction. The price, ?5 more than a crappy budget tire from your local supplier
Helpful 536
August 7, 2010
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