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GT Radial Champiro 228 View Gallery (1)

GT Radial Champiro 228

GT Radial Tyres Touring Summer

The GT Radial Champiro 228 is a Touring Summer tyre designed to be fitted to Passenger Cars.

6.7
Tyre Reviews Score Based on User Reviews
Limited Confidence View Breakdown
Dry Grip
84%
Wet Grip
82%
Road Feedback
84%
Handling
86%
Wear
70%
Comfort
88%
Buy again
80%
5 Reviews
82% Average
100,000 miles driven
2 Tests (avg: 23rd)
GT-Radial Champiro 228

GT-Radial Champiro 228

Summer Mid-Range
BETA
6.7 / 10
Based on User Reviews · 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
Score Components
Professional Tests
Weight: 80%
Tests: 2
Publications: 2
Period: 2013 - 2015
User Reviews
Weight: 15%
Reviews: 5
Avg Rating: 82%
Min Required: 5
Consistency
Weight: 5%
Score Std Dev: 0.05
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
2015 Market Overview - Braking Test Auto Bild 2015 185/60 R15 30/52 0 metrics
2013 European Summer Touring Tyre Test ADAC 2013 185/60 R15 15/19 0 metrics
All Tests
View Test Results
2
Tests
23rd
Average
15th
Best
30th
Worst
Latest Tyre Test Results
2015 Market Overview - Braking Test
185/60 R15 • 2015
30th/52
2013 European Summer Touring Tyre Test
185/60 R15 • 2013
15th/19
Top marks for wear
Relatively weak, especially on wet and dry roads

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Top 3 GT Radial Champiro 228 Reviews

Given 90% while driving a Toyota Corona (195/60 R14) on mostly country roads for 7,000 spirited miles
Awesome tyres, replaced the Supercats i had on the car. Huge decrease in road noise and grip better in the wet than the supercats did in the dry. I tend to drive twisty costal roads and they are superb on the corners. Only downside is they feel skiterish on gravel roads and mud tracks.
Helpful 698
May 17, 2018
Given 80% while driving a Subaru Outback (215/55 R17 V) on a combination of roads for 28,000 spirited miles
Great tyres, some of the best tyres I've ever used. Because I drive a Subaru Outback 3.0, the feedback from the tyres are second to none.I do venture off the tarmac a wee bit, down gravel tracks, up skifield access roads etc, not once have I thought 'I'm out of my depth here', they just give you confidence. Had these tyres for the best part of 2 years now. I've done around 42000 kms what I call spirited driving, (you can't drive a Subaru and not drive in this manner). Swapped them around regularly. My first thought was 'their American, their not going to last', seeing as though the Yanks drive on roads far smoother than the ones we have over in New Zealand which are chip'n seal. How wrong I was. Reasonable price, tyres cost more here than in the UK, good value, if your in the market for a good touring tyre, here it is.
Helpful 650
March 5, 2013
Given 66% while driving a Subaru Outback (215/55 R17 T) on a combination of roads for 10,000 average miles
A few years ago, I submitted a review on these tyres,overall I gave them a recommendation for anyone wanting good touring tyres for a reasonable price.I live in NZ and the roads are very similar to those found in the UK.
I had to go and get some more tyres after only 18000kms.The tyre depot said that GT Radial had changed their tyre compound and had made it a lot softer without telling any of them, hence they have now dropped GT Radial and have become Maxxis dealers. There is nothing wrong with these tyres but their durability is now poor, it will be interesting to see what these Maxxis tyres are like as we approach winter. Shame on you GT Radial for changing something that was not broken.
Helpful 507
May 1, 2015

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