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Petlas Glacier W661 View Gallery (1)
175-225/45-70 R13-17 18 sizes 2019 Winter rated

Petlas Glacier W661

Petlas Tyres Touring Winter

The Petlas Glacier W661 is a Touring Winter tyre designed to be fitted to Passenger Cars.

1.3
Tyre Reviews Score Based on Professional Tests
Medium Confidence View Breakdown
Dry Grip
50%
Wet Grip
20%
Road Feedback
40%
Handling
40%
Wear
100%
Comfort
50%
Buy again
10%
Snow Grip
100%
Ice Grip
100%
1 Reviews
57% Average
0 miles driven
1 Tests (avg: 18th)
Petlas Glacier W661

Petlas Glacier W661

Winter Economy
BETA
1.3 / 10
Based on Professional Tests · Medium Confidence · Updated 30 Jan 2026

The Tyre Reviews Score is the most comprehensive tyre 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
Category Scores
Wet
100
2x / 3 tests
Dry
100
1.2x / 2 tests
Comfort
80
0.29x / 1 test
Value
67.2
0.38x / 1 test
Snow
59.7
1.5x / 4 tests
Ice
47.6
1.26x / 4 tests
Cross-Category Performance

Cross-category scores are derived metrics that combine data from multiple test disciplines to evaluate real-world performance characteristics.

Braking
74.4
4 tests
Handling
72.7
7 tests
Traction
57
2 tests
Score Components
Professional Tests
Weight: 80%
Tests: 1
Publications: 1
Period: 2020
User Reviews
Weight: 15%
Reviews: 1
Avg Rating: 56.7%
Min Required: 5
Consistency
Weight: 5%
Score Std Dev: 0.74
History Points: 6
Methodology & Configuration
Scoring Process
  1. Collect Test Data: Gather results from professional tyre 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 1.8 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 8 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 0.1 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
Data Sources
TestPublicationDateSizePositionMetrics
2020 Nordic and Studded Winter Tyre Test Test World 2020 205/55 R16 18/20 15 metrics
All Tests
View Test Results
1
Tests
18th
Average
18th
Best
18th
Worst
Latest Tyre Test Results
2020 Nordic and Studded Winter Tyre Test
205/55 R16 • 2020
18th/20
Very good braking and handling in the dry and wet.
Very weak grip on ice, understeer in the snow.
Size Fuel Wet Noise
13 inch
175/70 R13 82 T D C 70
14 inch
175/65 R14 82 T D C 70
185/65 R14 86 T D C 70
15 inch
185/65 R15 88 T D C 70
195/65 R15 91 T C C 70
205/65 R15 94 T C C 70
185/60 R15 88 T D C 70
195/60 R15 88 T D C 70
16 inch
205/60 R16 92 T C C 70
205/60 R16 96 T C C 70
195/55 R16 87 T D C 70
205/55 R16 91 T C C 70
215/55 R16 97 T C C 72
17 inch
215/55 R17 98 T C C 72
225/55 R17 101 T C C 72
215/50 R17 95 T C C 72
225/50 R17 98 T C C 72
225/45 R17 94 T D C 72
View All Sizes and EU Label Scores for the Petlas Glacier W661 >>

Questions and Answers for the Petlas Glacier W661

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Latest Petlas Glacier W661 Reviews

Given 57% while driving a Renault Clio IV TCe 90 (195/55 R16) on for 0 miles
I’ve been using these tires for about 2 years on my Clio 0.9 TCe.
Snow & Ice Performance:
Exceptional grip on snow and ice—truly impressive.
Possibly even better than some premium brands in winter traction.
Dry Road Performance:
Mediocre at best. Performs like a standard economical winter tire.
If you don’t expect above-average dry performance, it’s adequate.
Wet Road Performance:
The biggest drawback. Even with a low-powered car like my 90 HP Clio, the tires are prone to slipping.
Braking on wet roads quickly triggers ABS, and cornering is very poor.
Durability:
Very hard compound—wear is minimal even under aggressive driving.
Thick tread contributes to poor wet grip, higher fuel consumption, and more road noise.
Conclusion:
Excellent choice if you drive in northern, snowy regions.
Not suitable for aggressive wet or dry driving conditions.
Overall, this tire excels in snow/ice but compromises on comfort, noise, and wet traction.
Ask a question | Helpful 273
September 22, 2025