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Kormoran Gamma B2

The Kormoran Gamma B2 is a High Performance Summer tyre designed to be fitted to Passenger Cars.

5.2
Tyre Reviews Score Based on User Reviews
Limited Confidence View Breakdown
Dry Grip
58%
Wet Grip
33%
Road Feedback
46%
Handling
41%
Wear
48%
Comfort
56%
Buy again
32%
18 Reviews
45% Average
162,000 miles driven
3 Tests (avg: 32nd)
Kormoran Gamma B2

Kormoran Gamma B2

Summer Economy
BETA
5.2 / 10
Based on User Reviews · Limited 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
Score Components
Professional Tests
Weight: 80%
Tests: 3
Publications: 1
Period: 2012 - 2016
User Reviews
Weight: 15%
Reviews: 18
Avg Rating: 44.8%
Min Required: 5
Consistency
Weight: 5%
Score Std Dev: 1.59
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 1.8 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
2016 Market Overview - Braking Test Auto Bild 2016 205/55 R16 41/50 0 metrics
2013 54 Tyre Braking Test 2013 195/65 R15 20/54 0 metrics
2012 Autobild 50 Tyre Braking Test Auto Bild 2012 225/45 R17 35/45 0 metrics
3
Tests
32nd
Average
20th
Best
41st
Worst
Latest Tyre Test Results
41st/50
2013 54 Tyre Braking Test
195/65 R15 • 2013
20th/54
35th/45

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Top 3 Kormoran Gamma B2 Reviews

Given 44% while driving a Nissan Qashqai (225/45 R17) on mostly town for 22,000 easy going miles
Cheap tire with acceptable price / quality ratio. It serves the purpose for which they are made and destined. For normal driving is good. only slightly negative note on the noise. They are quite noisy and this is annoying to me ..
Ask a question | Helpful 570
January 15, 2018
Given 29% while driving a BMW 525D (225/55 R17 W) on mostly motorways for 6,000 easy going miles
I had to buy these tyres at a place where my Bridgestone Turanza runflats let me down and I did not want to wait 3 days for decent replacements to be shipped.
This was pretty much the worst type I ever drove in 1Mio km (doing 50K km per year, mostly on highways 80%). While the dry grip is borderline, in all other disciplines it is a low performer. The tyre seems to be very soft and wears quite fast. In handling, the car feels like a boat at rough waters. Increasing the pressure, things get better, but then at most it is borderline again. The noise was average and the comfort was better than the runflats I had, but this is in the nature of runflats to be less comfortable. After 10K km I decided that is is not worth the anger and trashed them.
I was about to go for non-runflats but I decided to give runflats another try (Bridgestone Driveguard).
January 21, 2018
Given 47% while driving a Vauxhall (215/55 R16 V) on a combination of roads for 10,000 average miles
Purchased these tyre's in June 2015, they are at legal limit now April 1st 2016. Think i am the April fool. Not even done 10000 miles. Load of cheap rubbish.
April 3, 2016
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Latest Kormoran Gamma B2 Reviews

Given 83% while driving a Opel Astra J Sports Tourer (215/50 R17 W) on mostly town for 5,000 easy going miles
My driving is mostly in town and my style now having 2 kids in the car is very slow. The speed's i've testet the tires are maximum 80miles and at these speeds the tires want give you any trouble on dry or wet...
If you are looking for a cheep tire to do your job i believe is one of the best choises you'll make.
The only noticable bad characteristic is the very, very, very soft sides that want let you make quick changes on lanes. It's realy bad when you have to avoide something on the road and you don't feel comfort to do it.. You need to be very carefull!!!
June 27, 2017
Given 24% while driving a Nissan Qashqai (215/55 R18 V) on a combination of roads for 9,000 easy going miles
tyres are no good one tyre needs replacing the other 3 will have to be done as well tyres have only been on since September of 2016 wet conditions they are useless for skidding.when you try to find phone number you have to leave a message for them and they still donot reply to you
June 10, 2017
Check out how the BEST all seasons tyres perform against premium summer and winter tyres!
Given 17% while driving a Audi A3 (225/45 R17) on mostly motorways for 10,000 average miles
The tyres are terrible. I would never purchase again.
May 19, 2017
Given 33% while driving a Audi A6 S line, LeMans 2.0 TDi 170 (225/45 R17) on a combination of roads for 4,000 easy going miles
Worst tyres I ever had! Sensible driver. I haven't had more than 4 months with very little use and they are worn more than the previous old tyres which were switched to the rear wheels. I found my self skidding constantly even at low speeds on corners and roundabouts. Complete waste of time and money.
January 11, 2017
Given 46% while driving a Fiat Punto GT turbo (225/45 R17) on a combination of roads for 6,000 average miles
On wet conditions these tyres are dangerous..
January 8, 2017
Given 20% while driving a Mazda 6 (225/45 R17) on a combination of roads for 5,000 easy going miles
Cheap rubbish tyre never agaain
January 9, 2016
Given 29% while driving a Honda Aerodeck 1.8 vti (195/55 R15 V) on a combination of roads for 4,000 average miles
I hated them!
In dry are almost on average but on wet are very dangerous!
September 11, 2015
Given 94% while driving a Toyota Avensis (215/55 R17 V) on mostly motorways for 29,000 average miles
paid a good price for them for my avensis but didnt notice any difference
compared to the originals that came on car. read some reviews above and they must be driving like lunatics?
February 28, 2015
Given 60% while driving a BMW 320td (225/45 R17) on a combination of roads for 0 average miles
they are ok in dry with my 320td compact... but on the wet they are awful, but fun because i got sideways in the roundabouts at 25km/h.
fuel mileage is 8,7liters every 100kms
August 30, 2014
Given 49% while driving a BMW 318 (205/55 R16 V) on a combination of roads for 10,000 average miles
I drove those for 2 years and I am not happy at all. The first year they were slightly better but after that they lost the grip. The grabs are there but they will not even make a sound in a sudden stop or skid. the ABS non-stop helps and the ASC almost every time when I go forward on a traffic light. Don't buy.
October 1, 2013
Given 40% while driving a Opel vectra c (215/50 R17) on a combination of roads for 3,000 average miles
ON JANUARY I HAD INSTALLED A SET OF GAMMA B2 (NEW) ON MY OPEL VECTRA GTS(1.8XER).SO FAR,I COVERED AROUND 3,000MILES.MY DRIVING STYLE IS OF AN AVERANGE MOTORIST.ON THE DRY ROAD THEIR PERFORMANCE IS GOOD.ON THE WET,PATHETIC.I WILL NOT BUY THESE TYRES AGAIN.
April 15, 2013
Given 74% while driving a Ford Focus MK3 (205/50 R17 W) on mostly town for 5,000 average miles
Good confort, good feedback off the road, on the limit is a little inaccurate, But with the great price if want a good Price on a tyre with median quality buy on of these.
October 13, 2012