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Sumitomo H/TR Z5 View Gallery (1)
205-275/35-55 R17-20 30 sizes 2021

Sumitomo H/TR Z5

Sumitomo Tires Ultra High Performance Summer

The Sumitomo HTR Z5 is a Ultra High Performance Summer tire designed to be fitted to Passenger Cars.

7.0
Tire Reviews Score Based on Professional Tests & User Reviews
Medium Confidence View Breakdown
Dry Grip
87%
Wet Grip
78%
Road Feedback
87%
Handling
85%
Wear
68%
Comfort
75%
Buy again
82%
7 Reviews
80% Average
40,000 miles driven
2 Tests (avg: 18th)
Sumitomo HTR Z5

Sumitomo HTR Z5

Summer Economy
BETA
7 / 10
Based on Professional Tests & User Reviews · Medium Confidence · Updated 22 Jun 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
Category Scores
Wet
70
2x / 5 tests
Dry
62.1
1.8x / 6 tests
Cross-Category Performance

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

Braking
73.6
4 tests
Handling
54.2
4 tests
Score Components
Professional Tests
Weight: 80%
Tests: 2
Publications: 2
Period: 2023 - 2025
User Reviews
Weight: 15%
Reviews: 7
Avg Rating: 80.2%
Min Required: 5
Consistency
Weight: 5%
Score Std Dev: 0.06
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
Data Sources
TestPublicationDateSizePositionMetrics
2025 Tire Rack UUHP Summer Tire Test Tire Rack 2025 275/35 R19 9/10 9 metrics
2023 Summer Tire Market Overview Auto Bild 2023 225/45 R18 27/48 2 metrics
All Tests
View Test Results
2
Tests
18th
Average
9th
Best
27th
Worst
Latest Tire Test Results
2025 Tire Rack UUHP Summer Tire Test
275/35 R19 • 2025
9th/10
Responsive steering and balanced feel make the HTR Z5 pleasant to drive, but its limited traction and longer braking distances keep it from being truly competitive. It’s agile but lacks the grip window needed for faster, more confident driving.
2023 Summer Tire Market Overview
225/45 R18 • 2023
27th/48
View Test Results

Questions and Answers for the Sumitomo HTR Z5

Ask a question
May 14, 2024

Do you know if this tire as got lifetime warranty

Yes, there is a lifetime warranty for defects. From the Sumitomo website: "Free Defect Replacement for the Life of Usable Tread"

Top 3 Sumitomo HTR Z5 Reviews

Given 79% while driving a Honda Civic Type R (225/35 R19) on mostly motorways for 2,000 spirited miles
Having just completed a trip across Europe to the Nurburgring, then completed laps, these tires held up extremely well. Although not designed for track use, the grip levels remained high and the wear is virtually nil. Am very impressed for the price point! If on a budget, then would recommend! 8/10.
Helpful 969
April 23, 2025
Given 30% while driving a Volvo V60 D6 AWD (235/45 R18) on a combination of roads for 12,000 spirited miles
yes good handling but woeful wear, not lasted 12000 miles had two sets
Helpful 897
July 5, 2024
Given 69% while driving a Nissan 370Z (275/35 R19) on a combination of roads for 5,000 spirited miles
Excellent dry grip. I maybe abusive to this tire but that said with 8k kms on this set the front tires are half worn while the rears needed replacement. Allow 800kms for proper break in. It will feel down right sketchy. After break-in these grip and become a real fun tire. I am seeing how far the rear will without the extreme abuse. No drifting this time.
Helpful 1067
June 5, 2023

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Latest Sumitomo HTR Z5 Reviews

Initial Impressions Review
Given 74% while driving a Honda Civic Type R (225/35 R19) on for 11,000 miles
These tires have survived 2 trips across Europe to the Nurburgring, then completed wet and dry laps at pace! Plus daily use over a period of 12 months. Tread wear is an even 5-6mm across all 4 tires at 11k miles. Fairly impressive due to the low price point! Not recommended for track use, but will definitely stand up to some abuse.
Helpful 8
May 21, 2026
Given 95% while driving a Ford Focus (235/40 R18) on a combination of roads for 2,000 average miles
Not had them on more than 2 months but have just done a 790 miles drive in one day across Europe speeds upto 125mph. . And can say from an average person’s perspective they are a brilliant tire. They are quiet compared to some of the other brands iv had in the past I’d put them with something like continentals or Dunlop. Would definitely recommend and buy again. Road noise is a big part of my problem with 235/40/18s more so after 13 hrs of motorway driving. And can say these tiers are worth every penny.
Helpful 875
July 26, 2023
Given 87% while driving a Volkswagen Passat B7 (225/45 R17) on a combination of roads for 4,000 spirited miles
Dry grip is as good as any other performance tire, wet grip is also up there with the other performance tires.
Helpful 835
July 15, 2023
Given 87% while driving a Volkswagen Passat B7 (225/45 R17) on a combination of roads for 4,000 spirited miles
Dry grip is as good as any other performance tire, wet grip is also up there with the other performance tires.
Helpful 999
July 14, 2023
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