Tests – · none yet Owners 57 · 13 reviews
Head-to-head
Updated
Bridgestone S20 vs Pirelli Diablo — 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 + 0 road tests and 13 + 9 owner reviews. How we score
Diablo leads, 67–63 Narrow edge
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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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65
Dry
S20 +263Why this score
Source S20 Diablo Professional tests (TWG score) ≈ 66 (est.) ≈ 65 (est.) Reviews found online 64 60 S20: 60% × 66.1 (est.) + 40% × 63.5 = 65
Diablo: 60% × 64.5 (est.) + 40% × 59.6 = 63
No road tests of dry for S20. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.41).
No road tests of dry for Diablo. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.41).
-
66
Wet
Diablo +470Why this score
Source S20 Diablo Professional tests (TWG score) ≈ 67 (est.) ≈ 70 (est.) Reviews found online 65 70 S20: 60% × 67.5 (est.) + 40% × 64.8 = 66
Diablo: 60% × 70.3 (est.) + 40% × 69.9 = 70
No road tests of wet for S20. 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 Diablo. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).
-
65
Comfort
Diablo +166Why this score
Source S20 Diablo Professional tests (TWG score) ≈ 68 (est.) ≈ 68 (est.) Reviews found online 64 64 S20: 40% × 67.6 (est.) + 60% × 63.5 = 65
Diablo: 40% × 67.8 (est.) + 60% × 64.2 = 66
No road tests of comfort for S20. 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 Diablo. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.20).
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50
Treadwear
Diablo +1868Why this score
Source S20 Diablo Professional tests (TWG score) ≈ 57 (est.) ≈ 67 (est.) Reviews found online 39 69 S20: 60% × 56.7 (est.) + 40% × 39.4 = 50
Diablo: 60% × 67.3 (est.) + 40% × 68.6 = 68
No road tests of treadwear for S20. 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 Diablo. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.36).
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67
Handling (owners)
S20 +265Why this score
Source S20 Diablo Reviews found online 67 65
Scores at a glance
| Category | Bridgestone S20 | Pirelli Diablo |
|---|---|---|
| Relative Score | 63 | 67 |
| Dry | 65 | 63 |
| Wet | 66 | 70 |
| Comfort | 65 | 66 |
| Treadwear | 50 | 68 |
| Handling (owners) | 67 | 65 |
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
Less important
NotLessNeutralImportantMost
Neutral
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Recomputed
Headline score
63
/ 100
S20
67
/ 100
Diablo
Pros, cons & observations
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
Tire A S20
Pros
- Exceptional grip levels in both wet and dry conditions
- Progressive and predictable handling characteristics
- Strong performance during aggressive road riding and track use
Cons
- Very short tread life, particularly on high-torque motorcycles
- Rapid degradation and squaring off of the rear tire
- Front tire can be slow to reach optimal operating temperature
Tire B Diablo
Pros
- Excellent dry grip once the tire reaches operating temperature
- Inspiring feedback and planted handling for confident cornering
- Strong performance in wet weather conditions
Cons
- Rapid rear tire wear and tendency to square off
- Requires significant warm-up time to reach optimal traction
- Can feel unstable or 'sketchy' in cold or damp conditions before warming up
Specs side by side
| Attribute | A · Bridgestone S20 | B · Pirelli Diablo |
|---|---|---|
| Category | Summer | Summer |
| Vehicle type | Motorcycle | Motorcycle |
Which one should you actually buy?
63
/ 100
Bridgestone S20
67
/ 100
Pirelli Diablo
Narrow edge: Pirelli Diablo — better treadwear and wet. Where the Bridgestone S20 is ahead, it is by less than 3 points. Bridgestone S20 rests on little evidence so far (0 tests, 13 reviews), so read this result as provisional. Pirelli Diablo rests on little evidence so far (0 tests, 9 reviews), so read this result as provisional.
Pick tire B
You want the longest tread life
Pirelli Diablo scores 68 vs 50 on treadwear.
Pick tire B
Your priority is wet-weather safety
Pirelli Diablo scores 70 vs 66 on wet.
Tire A · Bridgestone S20
Tire B · Pirelli Diablo
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S20 or Diablo?
Which is better in the wet, S20 or Diablo?
Pirelli Diablo, 70 vs 66 on our wet score.
Which grips better on dry roads, S20 or Diablo?
Neither, by our numbers: 65 vs 63 on the dry score, within 3 points.
Which is more comfortable, S20 or Diablo?
Neither, by our numbers: 65 vs 66 on the comfort score, within 3 points.
Which lasts longer, S20 or Diablo?
Pirelli Diablo, 68 vs 50 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