Tests – · none yet Owners 64 · 31 reviews
Head-to-head
Updated
Nitto NT420S vs Nitto NT555 G2 — 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 + 2 road tests and 31 + 412 owner reviews. How we score
NT420S is ahead, 66–58
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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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69
Dry
NT420S +1455Why this score
Source NT420S NT555 G2 Professional tests (TWG score) · – / 1 tests ≈ 68 (est.) 49 Reviews found online 69 64 NT420S: 60% × 68.4 (est.) + 40% × 69 = 69
NT555 G2: 60% × 49.1 + 40% × 63.8 = 55
No road tests of dry for NT420S. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.41).
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70
Wet
NT420S +1951Why this score
Source NT420S NT555 G2 Professional tests (TWG score) · – / 1 tests ≈ 70 (est.) 48 Reviews found online 69 54 NT420S: 60% × 69.8 (est.) + 40% × 69.1 = 70
NT555 G2: 60% × 48.3 + 40% × 54 = 51
No road tests of wet for NT420S. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).
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57
Snow
NT420S +948Why this score
Source NT420S NT555 G2 Professional tests (TWG score) ≈ 63 (est.) ≈ 58 (est.) Reviews found online 47 33 NT420S: 60% × 63 (est.) + 40% × 47 = 57
NT555 G2: 60% × 58.5 (est.) + 40% × 32.7 = 48
No road tests of snow for NT420S. 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 NT555 G2. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.32).
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68
Comfort
NT420S +266Why this score
Source NT420S NT555 G2 Professional tests (TWG score) ≈ 68 (est.) ≈ 68 (est.) Reviews found online 67 65 NT420S: 40% × 68.4 (est.) + 60% × 67.3 = 68
NT555 G2: 40% × 67.9 (est.) + 60% × 65 = 66
No road tests of comfort for NT420S. 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 NT555 G2. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.20).
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69
Noise
NT420S +366Why this score
Source NT420S NT555 G2 Professional tests (TWG score) ≈ 66 (est.) ≈ 66 (est.) Reviews found online 72 64 NT420S: 60% × 66.4 (est.) + 40% × 71.6 = 69
NT555 G2: 60% × 66.4 (est.) + 40% × 64.2 = 66
No road tests of noise for NT420S or NT555 G2. The test half is the tested tires’ average (66): owners’ noise ratings barely follow the road tests.
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62
Treadwear
NT555 G2 +1476Why this score
Source NT420S NT555 G2 Professional tests (TWG score) · – / 1 tests ≈ 64 (est.) 83 Reviews found online 60 66 NT420S: 60% × 64 (est.) + 40% × 59.5 = 62
NT555 G2: 60% × 83.3 + 40% × 66 = 76
No road tests of treadwear for NT420S. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.36).
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–
Handling (owners)
No comparison62Why this score
Source NT420S NT555 G2 Reviews found online – 62
Scores at a glance
| Category | Nitto NT420S | Nitto NT555 G2 |
|---|---|---|
| Relative Score | 66 | 58 |
| Dry | 69 | 55 |
| Wet | 70 | 51 |
| Snow | 57 | 48 |
| Comfort | 68 | 66 |
| Noise | 69 | 66 |
| Treadwear | 62 | 76 |
| Handling (owners) | – | 62 |
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
Only one of the two tires has a score here, so this weight changes nothing in the head-to-head.
Recomputed
Headline score
66
/ 100
NT420S
58
/ 100
NT555 G2
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 NT420S
Pros
- Exceptional dry and wet traction with high grip levels
- Stylish and distinctive tread pattern design
- Smooth, quiet ride quality compared to stock or alternative options
Cons
- Shorter tread life due to a softer rubber compound
- Tires can become noticeably noisier as mileage increases (after around 12,000 miles)
- Limited capability in heavy winter or snow conditions
Tire B NT555 G2
Pros
- Aggressive, visually appealing tread pattern and sidewall design
- Exceptional value and lower price point compared to premium brands like Michelin or Pirelli
- Long-lasting tread life and slow wear rates for a summer performance tire
Cons
- Poor wet-weather traction, with multiple users reporting hydroplaning and a slippery feel in the rain
- Lack of straight-line traction and wheel spin under heavy acceleration, especially on high-horsepower RWD vehicles
- Subpar performance in cooler temperatures or cold conditions, requiring heat to grip properly
Specs side by side
| Attribute | A · Nitto NT420S | B · Nitto NT555 G2 |
|---|---|---|
| Category | Touring Summer tire | Summer |
| Vehicle type | SUV and 4x4 | Passenger Car / Crossover |
| Sizes available | 11 | 88 |
| Rim diameters | 17″ – 22″ | 15″ – 22″ |
| Tread depth | 10.7/32″ | 10.2/32″ |
| UTQG | 420 A A | 320 A A |
| Sidewall | Blackwall | Blackwall |
| Max pressure | 50 psi | 50 psi |
| Sizes in common | 1 | 1 |
Which one should you actually buy?
66
/ 100
Nitto NT420S
58
/ 100
Nitto NT555 G2
Winner: Nitto NT420S — better wet, dry and snow. Pick the Nitto NT555 G2 if treadwear matters most to you.
Pick tire A
Your priority is wet-weather safety
Nitto NT420S scores 70 vs 51 on wet.
Pick tire A
You want the most grip on dry roads
Nitto NT420S scores 69 vs 55 on dry.
Pick tire B
You want the longest tread life
Nitto NT555 G2 scores 76 vs 62 on treadwear.
Pick tire A
You drive through snowy winters
Nitto NT420S scores 57 vs 48 on snow.
Tire A · Nitto NT420S
Tire B · Nitto NT555 G2
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NT420S or NT555 G2?
Which is better in the wet, NT420S or NT555 G2?
Nitto NT420S, 70 vs 51 on our wet score.
Which grips better on dry roads, NT420S or NT555 G2?
Nitto NT420S, 69 vs 55 on our dry score.
Which is better in snow, NT420S or NT555 G2?
Nitto NT420S, 57 vs 48 on our snow score.
Which is quieter, NT420S or NT555 G2?
Nitto NT420S, 69 vs 66 on our noise score.
Which is more comfortable, NT420S or NT555 G2?
Neither, by our numbers: 68 vs 66 on the comfort score, within 3 points.
Which lasts longer, NT420S or NT555 G2?
Nitto NT555 G2, 76 vs 62 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