Tests – · none yet Owners 54 · 75 reviews
Head-to-head
Updated
Bridgestone Potenza S001 RFT vs Kumho Ecsta PS91 — Compared
Relative Score (0–100): 60% professional tests, 40% owner reviews.
Ecsta PS91 is ahead, 64–58
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Tests 78 · 6 tests Owners 55 · 471 reviews
“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.”
Category by category
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
-
59
Dry
Ecsta PS91 +1170Why this score
Source Potenza S001 RFT Ecsta PS91 Professional tests (TWG score) – 77 Reviews found online 54 61 -
61
Wet
Ecsta PS91 +1172Why this score
Source Potenza S001 RFT Ecsta PS91 Professional tests (TWG score) – 79 Reviews found online 58 62 -
55
Comfort
Ecsta PS91 +863Why this score
Source Potenza S001 RFT Ecsta PS91 Reviews found online 41 57 -
58
Noise
Ecsta PS91 +1068Why this score
Source Potenza S001 RFT Ecsta PS91 Professional tests (TWG score) – 77 Reviews found online 47 54 -
59
Treadwear
Potenza S001 RFT +950Why this score
Source Potenza S001 RFT Ecsta PS91 Reviews found online 55 40 -
53
Handling
Ecsta PS91 +760Why this score
Source Potenza S001 RFT Ecsta PS91 Reviews found online 53 60
Scores at a glance
| Category | Bridgestone Potenza S001 RFT | Kumho Ecsta PS91 |
|---|---|---|
| Relative Score | 58 | 64 |
| Dry | 59 | 70 |
| Wet | 61 | 72 |
| Comfort | 55 | 63 |
| Noise | 58 | 68 |
| Treadwear | 59 | 50 |
| Handling | 53 | 60 |
Higher is better. The Relative Score follows your weights below; category scores do not change.
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Wet grip and treadwear start at “Important” — the two things buyers rank highest. Move the sliders and the scores update instantly.
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Recomputed
Headline score
58
/ 100
Potenza S001 RFT
64
/ 100
Ecsta PS91
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
Community opinion on the Kumho Ecsta PS91 is generally mixed, praising them as a budget-friendly, good-looking max performance summer tire that rivals premium brands in daily driving comfort and appearance. However, multiple users note concerns regarding rapid tread wear, poor heat capacity under track conditions, and susceptibility to degrading under hard abuse compared to dedicated 200 treadwear or extreme performance tires.
r/E90
·180 upvotes ·2025-09-17
“New meaty tires set up installed, now I can order spacers Went up tire sizes and they definitely fill the gap a bit. First time running sticky kumhos on anytime so excited to see how they turn out.Specs are Kumho Ecsta Ps91 235/40/18 up front and 265/40/18 in the rear. Read more”
r/e46
·39 upvotes ·2025-03-26
“New wheels and tires for my ZHP My old wheels were super beat up and tires were showing wire so I figured I’d upgrade both. Was able to get these freshly powder coated squared set (18/8.5/et 50). Im excited to feel the Kuhmo Ecsta PS91 as they are a budget friendly performance tire. 255/35/18 tires all around”
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 friendly performance#ride quality and comfort#tread wear longevity#track and heat performance#tire mixing risks#fitment and appearance
Based on 16 community posts
Specs side by side
| Attribute | A · Bridgestone Potenza S001 RFT | B · Kumho Ecsta PS91 |
|---|---|---|
| Category | Summer Max Performance tires | Summer Extreme Performance tires |
| Vehicle type | Passenger Car / Crossover | Passenger Car / Crossover |
| Sizes available | 14 | — |
| Rim diameters | 17″ – 21″ | — |
| Tread depth | 9/32″ | — |
| UTQG | 280 A A | — |
| Sidewall | Blackwall | — |
| Max pressure | 51 psi | — |
Which one should you actually buy?
58
/ 100
Bridgestone Potenza S001 RFT
64
/ 100
Kumho Ecsta PS91
Winner: Kumho Ecsta PS91 — better dry, wet and noise. Pick the Bridgestone Potenza S001 RFT if treadwear matters most to you.
Pick tire B
You want the most grip on dry roads
Kumho Ecsta PS91 scores 70 vs 59 on dry.
Pick tire B
Your priority is wet-weather safety
Kumho Ecsta PS91 scores 72 vs 61 on wet.
Pick tire B
You want a quieter cabin
Kumho Ecsta PS91 scores 68 vs 58 on noise.
Pick tire A
You want the longest tread life
Bridgestone Potenza S001 RFT scores 59 vs 50 on treadwear.
Tire A · Bridgestone Potenza S001 RFT
Tire B · Kumho Ecsta PS91
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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.
Community buzz from Reddit and forums is shown for context only — it never changes the score.