Tests – · none yet Owners 46 · 79 reviews
Head-to-head
Updated
Bridgestone Potenza S001 RFT vs Kumho Ecsta PS91 — 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 + 6 road tests and 79 + 485 owner reviews. How we score
Ecsta PS91 leads, 57–53 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”
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
Ecsta PS91 +1367Why this score
Source Potenza S001 RFT Ecsta PS91 Professional tests (TWG score) · – / 6 tests ≈ 59 (est.) 77 Reviews found online 47 52 Potenza S001 RFT: 60% × 59.3 (est.) + 40% × 47.2 = 54
Ecsta PS91: 60% × 76.7 + 40% × 51.6 = 67
No road tests of dry for Potenza S001 RFT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.42).
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58
Wet
Ecsta PS91 +1068Why this score
Source Potenza S001 RFT Ecsta PS91 Professional tests (TWG score) · – / 6 tests ≈ 61 (est.) 79 Reviews found online 53 52 Potenza S001 RFT: 60% × 61.1 (est.) + 40% × 53.2 = 58
Ecsta PS91: 60% × 79 + 40% × 51.9 = 68
No road tests of wet for Potenza S001 RFT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).
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41
Snow
Potenza S001 RFT +536Why this score
Source Potenza S001 RFT Ecsta PS91 Professional tests (TWG score) ≈ 53 (est.) ≈ 50 (est.) Reviews found online 23 16 Potenza S001 RFT: 60% × 52.8 (est.) + 40% × 22.8 = 41
Ecsta PS91: 60% × 50.2 (est.) + 40% × 15.7 = 36
No road tests of snow for Potenza S001 RFT. 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 Ecsta PS91. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.37).
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46
Comfort
Ecsta PS91 +955Why this score
Source Potenza S001 RFT Ecsta PS91 Professional tests (TWG score) ≈ 63 (est.) ≈ 65 (est.) Reviews found online 35 49 Potenza S001 RFT: 40% × 62.8 (est.) + 60% × 34.6 = 46
Ecsta PS91: 40% × 65.3 (est.) + 60% × 48.5 = 55
No road tests of comfort for Potenza S001 RFT or Ecsta PS91. The test half is the tested tires’ average (69): owners’ comfort ratings barely follow the road tests.
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61
Noise
Ecsta PS91 +162Why this score
Source Potenza S001 RFT Ecsta PS91 Professional tests (TWG score) · – / 3 tests ≈ 67 (est.) 70 Reviews found online 53 50 Potenza S001 RFT: 60% × 66.6 (est.) + 40% × 52.8 = 61
Ecsta PS91: 60% × 70.2 + 40% × 50.2 = 62
No road tests of noise for Potenza S001 RFT. The test half is the tested tires’ average (67): owners’ noise ratings barely follow the road tests.
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58
Treadwear
Potenza S001 RFT +1444Why this score
Source Potenza S001 RFT Ecsta PS91 Professional tests (TWG score) ≈ 61 (est.) ≈ 54 (est.) Reviews found online 53 30 Potenza S001 RFT: 60% × 61.5 (est.) + 40% × 52.7 = 58
Ecsta PS91: 60% × 53.5 (est.) + 40% × 29.9 = 44
No road tests of treadwear for Potenza S001 RFT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.35).
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 0.35).
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49
Handling (owners)
Ecsta PS91 +554Why this score
Source Potenza S001 RFT Ecsta PS91 Reviews found online 49 54 -
–
Efficiency
No comparison48Why this score
Source Potenza S001 RFT Ecsta PS91 Professional tests (TWG score) · – / 3 tests – 48
Scores at a glance
| Category | Bridgestone Potenza S001 RFT | Kumho Ecsta PS91 |
|---|---|---|
| Relative Score | 53 | 57 |
| Dry | 54 | 67 |
| Wet | 58 | 68 |
| Snow | 41 | 36 |
| Comfort | 46 | 55 |
| Noise | 61 | 62 |
| Treadwear | 58 | 44 |
| Handling (owners) | 49 | 54 |
| Efficiency | – | 48 |
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
Not important
NotLessNeutralImportantMost
Only one of the two tires has a score here, so this weight changes nothing in the head-to-head.
Recomputed
Headline score
53
/ 100
Potenza S001 RFT
57
/ 100
Ecsta PS91
Only categories both tires have data for count toward the headline score.
Pros, cons & observations
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
Tire A Potenza S001 RFT
Pros
- Exceptional tread life and durability
- Precise steering feedback and handling responsiveness
- Strong dry-road grip
Cons
- Poor wet-weather traction and hydroplaning resistance
- High levels of road noise and cabin vibration
- Harsh, stiff ride quality over road imperfections
Tire B Ecsta PS91
Pros
- Exceptional dry and wet grip providing high confidence during spirited driving
- Significantly more affordable than premium flagship alternatives while offering comparable performance
- Stiff sidewalls enhance steering response, cornering stability, and feedback
Cons
- Accelerated tread wear and shorter lifespan, particularly with aggressive driving or on heavier vehicles
- Stiff sidewalls result in a firmer, less comfortable ride that transmits road imperfections
- Tendency to tramline or follow road grooves on straight highways
What real owners are saying
From Reddit, forums and review threads. Not part of our score
Tire A
Bridgestone Potenza S001 RFT
We haven't collected enough community discussion about this tire yet.
Tire B
Mixed
Kumho Ecsta PS91
The Kumho Ecsta PS91 is widely praised as an affordable, budget-friendly summer tire with attractive styling and respectable wet or daily street performance compared to pricier rivals like Michelin. However, several users express frustration with poor tread life, rapid wear, and insufficient grip or heat endurance under hard driving and track conditions. Others also note issues with sketchy handling, flat-spotting, or vibration when cold.
r/CarTrackDays
·1 upvote ·2026-07-20
“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”
r/e46
·222 upvotes ·2025-03-27
“Follow up on new wheels/tires for ZHP Well new wheels and tires are on aswell as aligned. I love the tire and fitment setup but really do not like the gunmetal grey color especially on imola. I will feel it out for a while but probably eventually powder coat to OEM silver. Wheels specs are 18 x 8.5 x ET50 with 255/35/18 Kuhmo Ecsta PS91 all around. -2.5 camber in the front and -2.8 in the rear.”
r/G37
·30 upvotes ·2026-03-21
“275/40 Square Can Fit on a Sedan Shout out to TireRack for having great information on actual tire size. Ecsta PS91 265/40 and ExtremeContact 275/40 has a tread width and section width difference of 0.1” and 0.2” respectively. Tires fit just about perfect. No rubbing so far, and don’t expect it to rub bc of the relatively minimal width change Really goes to show that tire brand matters for fitment Read more”
Top themes
#budget performance value#rapid tread wear#wet and dry traction#track and heat limitations#ride quality and appearance#Michelin alternative comparison
Based on 45 community posts
Specs side by side
| Attribute | A · Bridgestone Potenza S001 RFT | B · Kumho Ecsta PS91 |
|---|---|---|
| Category | Summer | Summer |
| Vehicle type | Passenger Car / Crossover | Passenger Car / Crossover |
| Sizes available | 14 | 1 |
| Rim diameters | 17″ – 21″ | 19″ |
| Tread depth | 9/32″ | 9.5/32″ |
| UTQG | 280 A A | 260 A A |
| Sidewall | Blackwall | Blackwall |
| Max pressure | 51 psi | 50 psi |
Which one should you actually buy?
53
/ 100
Bridgestone Potenza S001 RFT
57
/ 100
Kumho Ecsta PS91
Narrow edge: Kumho Ecsta PS91 — better dry, wet and comfort. Pick the Bridgestone Potenza S001 RFT if treadwear and snow matter most to you.
Pick tire A
You want the longest tread life
Bridgestone Potenza S001 RFT scores 58 vs 44 on treadwear.
Pick tire B
You want the most grip on dry roads
Kumho Ecsta PS91 scores 67 vs 54 on dry.
Pick tire B
Your priority is wet-weather safety
Kumho Ecsta PS91 scores 68 vs 58 on wet.
Pick tire B
You want the most comfortable ride
Kumho Ecsta PS91 scores 55 vs 46 on comfort.
Tire A · Bridgestone Potenza S001 RFT
Tire B · Kumho Ecsta PS91
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Potenza S001 RFT or Ecsta PS91?
Which is better in the wet, Potenza S001 RFT or Ecsta PS91?
Kumho Ecsta PS91, 68 vs 58 on our wet score.
Which grips better on dry roads, Potenza S001 RFT or Ecsta PS91?
Kumho Ecsta PS91, 67 vs 54 on our dry score.
Which is better in snow, Potenza S001 RFT or Ecsta PS91?
Bridgestone Potenza S001 RFT, 41 vs 36 on our snow score.
Which is quieter, Potenza S001 RFT or Ecsta PS91?
Neither, by our numbers: 61 vs 62 on the noise score, within 3 points.
Which is more comfortable, Potenza S001 RFT or Ecsta PS91?
Kumho Ecsta PS91, 55 vs 46 on our comfort score.
Which lasts longer, Potenza S001 RFT or Ecsta PS91?
Bridgestone Potenza S001 RFT, 58 vs 44 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