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Toyo NanoEnergy R38

The Toyo NanoEnergy R38 is a Premium Touring Summer tyre designed to be fitted to Passenger Cars.

6.8
Tyre Reviews Score Based on User Reviews
Limited Confidence View Breakdown
Dry Grip
88%
Wet Grip
81%
Road Feedback
78%
Handling
81%
Wear
76%
Comfort
80%
Buy again
84%
8 Reviews
81% Average
119,100 miles driven
Toyo NanoEnergy R38

Toyo NanoEnergy R38

Summer Mid-Range
BETA
6.8 / 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: 0
Publications: 0
User Reviews
Weight: 15%
Reviews: 8
Avg Rating: 81.1%
Min Required: 5
Consistency
Weight: 5%
Score Std Dev: 2.04
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
All Tests

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Top 3 Toyo NanoEnergy R38 Reviews

Given 91% while driving a Mazda 3 Skyactiv 2012 (225/45 R17) on a combination of roads for 32,000 spirited miles
Factory fitted on Mazda 3 2016 model. Have done 32000 miles on the front and will do more on back. Excellent grip and handling. A little noisy but not more than other tyres on previous cars such as Continentals and Michelins.
Ask a question | Helpful 901
January 9, 2021
Given 73% while driving a Mazda 3 Series (205/60 R16) on a combination of roads for 16,000 average miles
Good overall tire. The wet/dry grip is quite good and the tyre will let you know the limit. With my driving style I can't tell the difference from the previous premium brand I had except the price. I will definitely consider buying again.
August 18, 2020
Given 87% while driving a Mazda 3 Series (205/60 R16) on a combination of roads for 16,000 average miles
The tyres came fitted with the car and I like them. Good wet/dry braking and handling abilities well above average. The limits are set high, and they let know just before reaching them- especially on wet surface. Definitely one of the best mid range tyres I have ever used and punching above their price range. The front now is at 3 mm after almost 16k miles, so I would definitely buy again if available.
October 17, 2020
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Latest Toyo NanoEnergy R38 Reviews

Given 83% while driving a Mazda 3 Series (205/60 R16 V) on a combination of roads for 10,000 spirited miles
Very good tyres. They give nothing compared to premium brands. Great dry and wet grip.
June 23, 2019
Given 87% while driving a Mazda 3 Series (225/45 R17) on a combination of roads for 100 easy going miles
these tyres are as good as the ones they replace which were continentals.
October 27, 2018
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