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Starmaxx Ice Gripper W850

The Starmaxx Ice Gripper W850 is a Touring Winter tyre designed to be fitted to Passenger Cars.

1.9
Tyre Reviews Score Based on Professional Tests
Limited Confidence View Breakdown
Dry Grip
67%
Wet Grip
67%
Road Feedback
67%
Handling
63%
Wear
70%
Comfort
70%
Buy again
60%
4 Reviews
66% Average
8,500 miles driven
2 Tests (avg: 52nd)
Starmaxx Ice Gripper W850

Starmaxx Ice Gripper W850

Winter Economy
BETA
1.9 / 10
Based on Professional Tests · Limited Confidence · Updated 23 Feb 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
Wet
45.2
1.93x / 2 tests

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

Braking
45.2
2 tests
Score Components
Professional Tests
Weight: 80%
Tests: 2
Publications: 1
Period: 2020 - 2022
User Reviews
Weight: 15%
Reviews: 4
Avg Rating: 66.2%
Min Required: 5
Consistency
Weight: 5%
Score Std Dev: 0.65
History Points: 10
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 1.9 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
2022 Winter Tyre Market Overview Auto Bild 2022 215/55 R17 54/57 1 metrics
2020 Winter Tyre Market Overview - 52 Tyre Braking Test Auto Bild 2020 245/45 R18 50/49 1 metrics
2
Tests
52nd
Average
50th
Best
54th
Worst
Latest Tyre Test Results

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Top 3 Starmaxx Ice Gripper W850 Reviews

Given 71% while driving a Audi A3 Sportback (205/55 R16 H) on a combination of roads for 1,000 average miles
So far so good. I bought the tire a month ago. Tire is especially good at low temperatures. The grip is good on wet and snow too. Comfort is very nice too. The tires don't make much noise when riding slow or fast. I'm going to comment again at the end of the winter season.
December 20, 2017
Given 30% while driving a Alfa Romeo 156 1,8 TS (205/55 R16) on a combination of roads for 5,000 average miles
Not a very good tyre.
April 6, 2014
Given 97% while driving a BMW 735i E32 (205/65 R15) on a combination of roads for 2,000 average miles
Excellent and cheap tyre!!
March 30, 2014

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Latest Starmaxx Ice Gripper W850 Reviews

Volkswagen Golf (205/55 R16) on a combination of roads for 500 average miles
Hi, I've just bought these tyres. They seem to be of good quality, but it's too much early to judge! My seller said that are good tyres made in Turkey from Pirelli's group. In fact the design it's the same of Pirelli Zero... I write from Italy and I've paid 95,00 € each one.
waiting for your opinions...
Bye
November 22, 2012
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