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Dunlop Grandtrek ST20 View Gallery (1)
215-225/60-70 R16-17 8 sizes 2021

Dunlop Grandtrek ST20

Dunlop Tires Premium Touring All Season

The Dunlop Grandtrek ST20 is a Premium Touring All Season tire designed to be fitted to SUV and 4x4s.

6.7
Tire Reviews Score Based on User Reviews
Limited Confidence View Breakdown
Dry Grip
81%
Wet Grip
78%
Road Feedback
77%
Handling
79%
Wear
83%
Comfort
77%
Buy again
88%
9 Reviews
80% Average
245,000 miles driven
Dunlop Grandtrek ST20

Dunlop Grandtrek ST20

All Season Premium
BETA
6.7 / 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: 0
Publications: 0
User Reviews
Weight: 15%
Reviews: 9
Avg Rating: 80.3%
Min Required: 5
Consistency
Weight: 5%
Score Std Dev: 2.68
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
All Tests

Sorry, we don't currently have any magazine tire tests for the Dunlop Grandtrek ST20

Size Fuel Wet Noise
16 inch
215/65R16 98 S D D 71
215/65R16 98 H D D 70
P215/70R16 99 H C D 71
215/70R16 99 H C D 71
215/70R16 100 H C D 70
17 inch
225/60R17 99 H C D 70
225/60R17 99 H C D 70
215/60R17 96 H D D 71
215/60R17 96 H D D 71
18 inch
225/65R18 103 H C D 71
View All Sizes and EU Label Scores for the Dunlop Grandtrek ST20 >>

Questions and Answers for the Dunlop Grandtrek ST20

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Top 3 Dunlop Grandtrek ST20 Reviews

Given 84% while driving a Nissan Murano (225/65 R18) on a combination of roads for 35,000 easy going miles
Had these tires original on our 2009 Murano. changed them after 55000km. Bought Bridgestone Euporia 890 and will go back to these tires. Only problem with them was that the sides are wearing much quicker then the rest of the tire. Will try with a slightly higher pressure to see if that make some difference.
Helpful 865
December 1, 2019
Given 63% while driving a Mazda Tribute 2004 (215/70 R16) on a combination of roads for 15,000 easy going miles
Ok in dry , but not in wet.
Helpful 651
December 27, 2016
Given 84% while driving a Honda CR V III (225/65 R17) on mostly town for 500 easy going miles
Great tires I don't aspect its so well performance during dry and wet Great value and performance.
Helpful 667
June 11, 2015

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Latest Dunlop Grandtrek ST20 Reviews

Given 84% while driving a Nissan X Trail 2.2 DCi Sport (215/60 R17 H) on a combination of roads for 44,000 average miles
I am very impressed with these tires. On car from new and towed a caravan over 8,000 miles. Excellent performance
Helpful 643
June 13, 2013
Given 86% while driving a Daihatsu Terios (215/65 R16) on a combination of roads for 45,000 average miles
Original spec tires on my 2008 Terios. They have been used in mixed conditions and perform very well. Very confident at speed and in the wet. Wet grip not so good when you are at about 3mm or less. Snow traction and driving is also good. They last well 25,000 + easily achieved but would recommend not going below 3mm tread depth. I am on my 2nd set now and quite happy with these for this type of car.
Helpful 589
September 28, 2012
Given 87% while driving a Nissan X Trail 2.2 DCi Sport (225/45 R17) on a combination of roads for 46,500 average miles
Had these as original equipment on a 2007 Nissan x-trail turbo diesel. The tires have just been changed at 46,600 miles. The rears were OK but dry and crazed all over with cracks, the fronts were almost at the legal limit but again, cracks all over. Borrowed pirelli scorpions on my friends spare summer rims but they felt 'wrong' with vague handling from the front in tight corners. I've bought ST20 s again because I like them off road and the surefootedness on the road, even in the rainy uk, (and most sane folk don't tend to push it too much in a 4x4 in the wet) A good solid carcase tire, never a problem off road, not too noisy, not too 'bouncy'
Helpful 672
July 2, 2012
Given 89% while driving a Daihatsu Terios (215/65 R16 R) on a combination of roads for 0 average miles
I've done 45,000 km on a Diahatsu Terios 4X4 so far, hassle free, except one sidewall was damaged by a huge thorn in the bush; tire to be replaced.Probably still another 10,000km before changing the set. Slight discomfort/bounciness may well be caused by the short wheelbase of the Terios and not the tires - it's difficult to tell.
Helpful 596
April 2, 2012
Given 96% while driving a Nissan Murano (225/45 R17) on mostly town for 27,000 average miles
No problems over 27000 mixed motoring miles. Slightly noisy on rough concrete roads but excellent grip in all weathers, including snow and ice.
Helpful 650
October 2, 2011
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