Relative Score (0–100): the weighted average of the categories below, each 60% road tests and 40% owner reviews (comfort 40/60). Based on 6 + 0 road tests and 485 + 20 owner reviews. How we score
Ecsta PS91 leads, 57–54 Narrow edge
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Tests 77 · 6 tests Owners 42 · 485 reviews
Best test result: #1 of 11 in 2023 AUTO Straßenverkehr 2023 Summer Tire Test R18 (exterior noise)
“Putting some Kumho Ecsta PS91s on. Curious how they’ll do since my go to Falken rt660 doesn’t come in the oem 18” sizes”
Tests – · none yet Owners 44 · 20 reviews
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
| Source | Ecsta PS91 | Potenza S007 |
|---|---|---|
| Professional tests (TWG score) · 6 / – tests | 77 | ≈ 60 (est.) |
| Reviews found online | 51 | 50 |
Ecsta PS91: 60% × 76.7 + 40% × 51 = 66
Potenza S007: 60% × 60.3 (est.) + 40% × 49.5 = 56
No road tests of dry for Potenza S007. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.42).
| Source | Ecsta PS91 | Potenza S007 |
|---|---|---|
| Professional tests (TWG score) · 6 / – tests | 79 | ≈ 60 (est.) |
| Reviews found online | 52 | 52 |
Ecsta PS91: 60% × 78.8 + 40% × 51.5 = 68
Potenza S007: 60% × 60.4 (est.) + 40% × 51.8 = 57
No road tests of wet for Potenza S007. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).
| Source | Ecsta PS91 | Potenza S007 |
|---|---|---|
| Professional tests (TWG score) | ≈ 53 (est.) | ≈ 63 (est.) |
| Reviews found online | 15 | 46 |
Ecsta PS91: 60% × 53 (est.) + 40% × 15.1 = 38
Potenza S007: 60% × 62.9 (est.) + 40% × 46.2 = 56
No road tests of snow for Ecsta PS91. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.32).
No road tests of snow for Potenza S007. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.32).
| Source | Ecsta PS91 | Potenza S007 |
|---|---|---|
| Professional tests (TWG score) | ≈ 64 (est.) | ≈ 62 (est.) |
| Reviews found online | 48 | 35 |
Ecsta PS91: 40% × 64.5 (est.) + 60% × 47.7 = 54
Potenza S007: 40% × 61.9 (est.) + 60% × 35.2 = 46
No road tests of comfort for Ecsta PS91. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.20).
No road tests of comfort for Potenza S007. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.20).
| Source | Ecsta PS91 | Potenza S007 |
|---|---|---|
| Professional tests (TWG score) · 3 / – tests | 70 | ≈ 66 (est.) |
| Reviews found online | 50 | 47 |
Ecsta PS91: 60% × 70.2 + 40% × 49.5 = 62
Potenza S007: 60% × 66.3 (est.) + 40% × 47.1 = 59
No road tests of noise for Potenza S007. The test half is the tested tires’ average (66): owners’ noise ratings barely follow the road tests.
| Source | Ecsta PS91 | Potenza S007 |
|---|---|---|
| Professional tests (TWG score) | ≈ 53 (est.) | ≈ 54 (est.) |
| Reviews found online | 30 | 31 |
Ecsta PS91: 60% × 53.5 (est.) + 40% × 30 = 44
Potenza S007: 60% × 53.7 (est.) + 40% × 30.8 = 45
No road tests of treadwear for Ecsta PS91. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.36).
No road tests of treadwear for Potenza S007. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.36).
| Source | Ecsta PS91 | Potenza S007 |
|---|---|---|
| Reviews found online | 53 | 48 |
| Source | Ecsta PS91 | Potenza S007 |
|---|---|---|
| Professional tests (TWG score) · 3 / – tests | 47 | – |
| Category | Kumho Ecsta PS91 | Bridgestone Potenza S007 |
|---|---|---|
| Relative Score | 57 | 54 |
| Dry | 66 | 56 |
| Wet | 68 | 57 |
| Snow | 38 | 56 |
| Comfort | 54 | 46 |
| Noise | 62 | 59 |
| Treadwear | 44 | 45 |
| Handling (owners) | 53 | 48 |
| Efficiency | 47 | – |
Higher is better. The Relative Score follows your weights below; category scores do not change.
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.
Only one of the two tires has a score here, so this weight changes nothing in the head-to-head.
Ecsta PS91
Potenza S007
Only categories both tires have data for count toward the headline score.
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
From Reddit, forums and review threads. Not part of our score
The community views the Kumho Ecsta PS91 as an attractive, budget-friendly max performance summer tire that offers decent street traction, low noise, and a tread pattern resembling higher-end options like Michelin. However, opinions are split; while some drivers praise them as a great value alternative for daily driving and light spirited use, enthusiasts note limitations regarding rapid wear, subpar track endurance, and inferior grip compared to top-tier performance tires.
“my turbo came with a set of Kumho Ecsta PS91 in the OEM widebody sizes that were around a year old and had maybe lost 15% wear. coming from someone who loves PS4S, i hated them. grip was subpar. it felt wasteful to toss them though since they were relatively new and had decent tread left so i toughed them out. i got maybe 2k miles out of the rears before they needed replacement just from normal street / occasional spirited driving. they are not a great handling tire and they are quite bad from a wear perspective as well. just buy michelin or even continental and don't look back.”
“Pretty terrible idea, the PS91 will not have the same heat capacity as the V730, so your front/rear grip balance will change wildly during a session. With the non-200s on the front, at least you’ll understeer instead of oversteer/spin, but not ideal. An experienced driver might be able to work around this, if you’re new, this would be a dangerous situation. Similarly, I wouldn’t mix something like a yokohama AO52, which delivers all of its grip from cold and tends to overheat within a couple laps, with something like a hankook RS4, which famously takes some time to warm up and then delivers consistent grip for a long time”
“I've only got a couple thousand on them and just spirited driving in the mountains. I think they will easily go over 10k even with a few track events. I am thinking about getting a set for my SVT focus as I autoX with that car, much easier to drive at the limit than a turbocharged S197.”
Based on 46 community posts
We haven't collected enough community discussion about this tire yet.
| Attribute | A · Kumho Ecsta PS91 | B · Bridgestone Potenza S007 |
|---|---|---|
| Category | Summer | Summer |
| Vehicle type | Passenger Car / Crossover | Passenger Car / Crossover |
| Sizes available | 1 | 14 |
| Rim diameters | 19″ | 17″ – 20″ |
| Tread depth | 9.5/32″ | 9/32″ |
| UTQG | 260 A A | 240 A A |
| Sidewall | Blackwall | Blackwall |
| Max pressure | 50 psi | 50 psi |
Kumho Ecsta PS91
Bridgestone Potenza S007
Narrow edge: Kumho Ecsta PS91 — better wet, dry and comfort. Pick the Bridgestone Potenza S007 if snow matters most to you.
Bridgestone Potenza S007 scores 56 vs 38 on snow.
Kumho Ecsta PS91 scores 68 vs 57 on wet.
Kumho Ecsta PS91 scores 66 vs 56 on dry.
Kumho Ecsta PS91 scores 54 vs 46 on comfort.
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Kumho Ecsta PS91, 68 vs 57 on our wet score.
Kumho Ecsta PS91, 66 vs 56 on our dry score.
Bridgestone Potenza S007, 56 vs 38 on our snow score.
Kumho Ecsta PS91, 62 vs 59 on our noise score.
Kumho Ecsta PS91, 54 vs 46 on our comfort score.
Neither, by our numbers: 44 vs 45 on the treadwear score, within 3 points.
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
