Tests – · none yet Owners 47 · 75 reviews
Head-to-head
Updated
Bridgestone Ecopia EP150 vs Sumitomo HTR Z III — Compared
Relative Score (0–100): the weighted average of the categories below, each 60% road tests and 40% owner reviews (comfort 40/60). Based on 0 + 1 road tests and 75 + 42 owner reviews. How we score
HTR Z III is ahead, 61–55
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Category by category
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
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54
Dry
HTR Z III +1468Why this score
Source Ecopia EP150 HTR Z III Professional tests (TWG score) ≈ 59 (est.) ≈ 68 (est.) Reviews found online 47 68 Ecopia EP150: 60% × 59.1 (est.) + 40% × 46.8 = 54
HTR Z III: 60% × 67.9 (est.) + 40% × 67.6 = 68
No road tests of dry for Ecopia EP150. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.42).
No road tests of dry for HTR Z III. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.42).
-
58
Wet
HTR Z III +563Why this score
Source Ecopia EP150 HTR Z III Professional tests (TWG score) ≈ 61 (est.) ≈ 65 (est.) Reviews found online 53 61 Ecopia EP150: 60% × 60.9 (est.) + 40% × 52.9 = 58
HTR Z III: 60% × 65.1 (est.) + 40% × 60.6 = 63
No road tests of wet for Ecopia EP150. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).
No road tests of wet for HTR Z III. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).
-
48
Snow
Ecopia EP150 +1236Why this score
Source Ecopia EP150 HTR Z III Professional tests (TWG score) ≈ 57 (est.) ≈ 50 (est.) Reviews found online 34 14 Ecopia EP150: 60% × 57 (est.) + 40% × 33.8 = 48
HTR Z III: 60% × 49.7 (est.) + 40% × 14.4 = 36
No road tests of snow for Ecopia EP150. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.37).
No road tests of snow for HTR Z III. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.37).
-
55
Comfort
HTR Z III +1166Why this score
Source Ecopia EP150 HTR Z III Professional tests (TWG score) ≈ 65 (est.) ≈ 68 (est.) Reviews found online 48 65 Ecopia EP150: 40% × 65.2 (est.) + 60% × 47.6 = 55
HTR Z III: 40% × 68.4 (est.) + 60% × 65 = 66
No road tests of comfort for Ecopia EP150 or HTR Z III. The test half is the tested tires’ average (69): owners’ comfort ratings barely follow the road tests.
-
60
Noise
HTR Z III +565Why this score
Source Ecopia EP150 HTR Z III Professional tests (TWG score) ≈ 67 (est.) ≈ 67 (est.) Reviews found online 50 63 Ecopia EP150: 60% × 66.6 (est.) + 40% × 49.8 = 60
HTR Z III: 60% × 66.6 (est.) + 40% × 62.6 = 65
No road tests of noise for Ecopia EP150 or HTR Z III. The test half is the tested tires’ average (67): owners’ noise ratings barely follow the road tests.
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55
Treadwear
HTR Z III +1166Why this score
Source Ecopia EP150 HTR Z III Professional tests (TWG score) · – / 1 tests ≈ 60 (est.) 70 Reviews found online 47 59 Ecopia EP150: 60% × 59.5 (est.) + 40% × 47.2 = 55
HTR Z III: 60% × 70.2 + 40% × 59 = 66
No road tests of treadwear for Ecopia EP150. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.35).
-
50
Handling (owners)
HTR Z III +1666Why this score
Source Ecopia EP150 HTR Z III Reviews found online 50 66
Scores at a glance
| Category | Bridgestone Ecopia EP150 | Sumitomo HTR Z III |
|---|---|---|
| Relative Score | 55 | 61 |
| Dry | 54 | 68 |
| Wet | 58 | 63 |
| Snow | 48 | 36 |
| Comfort | 55 | 66 |
| Noise | 60 | 65 |
| Treadwear | 55 | 66 |
| Handling (owners) | 50 | 66 |
Higher is better. The Relative Score follows your weights below; category scores do not change.
Weight the categories that matter to you
Wet grip starts at “Important”. Treadwear starts at “Neutral” here: road tests measured it for at most one of the two tires, so it rests on owner reviews. Move the sliders and the scores update instantly.
Important
NotLessNeutralImportantMost
Important
NotLessNeutralImportantMost
Neutral
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Neutral
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Recomputed
Headline score
55
/ 100
Ecopia EP150
61
/ 100
HTR Z III
The professional test results behind the scores
Per discipline: the average % of the best tire over every test both tires were in, and how many of those tests each one won. “Different tests” rows compare results from separate tests.
| Discipline | Category | Ecopia EP150 | HTR Z III | Δ | Head-to-head |
|---|---|---|---|---|---|
| Also published by the testers (not in the score) | |||||
| Overall Ranking | Overall | #4/16 2014 ADAC 175/65 R14 Summer Tyre Test | #17/22 2022 Consumer Reports Ultra High Performance Summer Tires | – | Different tests |
Pros, cons & observations
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
Tire A Ecopia EP150
Pros
- High level of ride comfort and low-speed smoothness
- Generally durable construction capable of handling potholes
- Satisfactory dry-road handling for casual, daily driving
Cons
- Frequently cited as dangerous or unpredictable in wet conditions
- Noticeable increase in road noise as the tire ages
- Inconsistent tread wear, with some users reporting premature failure
Tire B HTR Z III
Pros
- Excellent price-to-performance ratio
- Strong dry handling and steering feedback
- Quiet and comfortable ride quality
Cons
- Inconsistent wet-weather side grip during cornering
- Limited traction under heavy acceleration on high-horsepower vehicles
- Not suitable for winter or freezing conditions
Specs side by side
| Attribute | A · Bridgestone Ecopia EP150 | B · Sumitomo HTR Z III |
|---|---|---|
| Category | Summer | Summer |
| Vehicle type | Passenger Car / Crossover | Passenger Car / Crossover |
| Sizes available | 24 | 1 |
| Rim diameters | 13″ – 17″ | 19″ |
| Tread depth | — | 10/32″ |
| UTQG | 200 B B | 300 A A |
| Sidewall | Blackwall | Blackwall |
| Max pressure | — | 50 psi |
Which one should you actually buy?
55
/ 100
Bridgestone Ecopia EP150
61
/ 100
Sumitomo HTR Z III
Winner: Sumitomo HTR Z III — better handling, dry and comfort. Pick the Bridgestone Ecopia EP150 if snow matters most to you.
Pick tire B
You enjoy sharp, responsive handling
Sumitomo HTR Z III scores 66 vs 50 on handling.
Pick tire B
You want the most grip on dry roads
Sumitomo HTR Z III scores 68 vs 54 on dry.
Pick tire A
You drive through snowy winters
Bridgestone Ecopia EP150 scores 48 vs 36 on snow.
Pick tire B
You want the most comfortable ride
Sumitomo HTR Z III scores 66 vs 55 on comfort.
Tire A · Bridgestone Ecopia EP150
Tire B · Sumitomo HTR Z III
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Ecopia EP150 or HTR Z III?
Which is better in the wet, Ecopia EP150 or HTR Z III?
Sumitomo HTR Z III, 63 vs 58 on our wet score.
Which grips better on dry roads, Ecopia EP150 or HTR Z III?
Sumitomo HTR Z III, 68 vs 54 on our dry score.
Which is better in snow, Ecopia EP150 or HTR Z III?
Bridgestone Ecopia EP150, 48 vs 36 on our snow score.
Which is quieter, Ecopia EP150 or HTR Z III?
Sumitomo HTR Z III, 65 vs 60 on our noise score.
Which is more comfortable, Ecopia EP150 or HTR Z III?
Sumitomo HTR Z III, 66 vs 55 on our comfort score.
Which lasts longer, Ecopia EP150 or HTR Z III?
Sumitomo HTR Z III, 66 vs 55 on our treadwear score.
How do we compare tires?
Every category score blends two independent signals. 60% comes from professional tire tests (braking distances, lap times, noise measurements), each result compared with every other tire in the same test and newer tests counting more. 40% comes from owner reviews found online, adjusted for how generously each site rates. Both use one scale: the average tested tire gets 70, the best 100. When a tire has only one of the two, the missing half is estimated from the other and the score stays closer to average; with no road test and fewer than five owner reviews it gets no score yet.
Handling is the exception: road tests measure it inside the dry and wet scores, so its own row comes from owner ratings only and starts as less important.
Community buzz from Reddit and forums is shown for context only — it never changes the score. Full methodology