70
/ 100
Objective (60%)
–/100
No test data yet
User signal (40%)
73/100
13 owner reviews
Prices change daily — check the retailer for your size.
Head-to-head
Updated May 2026
Bridgestone S20 vs Pirelli Diablo — Compared (May 2026)
Our Relative Score blends 60% objective test data with 40% owner-review signal — so any two tires can be compared even if they were never tested on the same day.
VS
78
/ 100
Objective (60%)
–/100
No test data yet
User signal (40%)
75/100
9 owner reviews
Prices change daily — check the retailer for your size.
VerdictWinner: Pirelli Diablo — better treadwear and wet. Pick the Bridgestone S20 if dry and handling matter most to you.
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Category breakdown
5 categories, side by side
Each bar is the Relative Score for that category. Expand a tile to see the test results and owner ratings behind it.
Dry
Score (0–100)
S20 leads by 9
Why this score
| Source | S20 | Diablo |
|---|---|---|
| Tyre Reviews owners | 82 | 73 |
Wet
Score (0–100)
Diablo leads by 7
Why this score
| Source | S20 | Diablo |
|---|---|---|
| Tyre Reviews owners | 72 | 79 |
Comfort
Score (0–100)
S20 leads by 1
Why this score
| Source | S20 | Diablo |
|---|---|---|
| Tyre Reviews owners | 80 | 79 |
Treadwear
Score (0–100)
Diablo leads by 33
Why this score
| Source | S20 | Diablo |
|---|---|---|
| Tyre Reviews owners | 50 | 83 |
Handling
Score (0–100)
S20 leads by 8
Why this score
| Source | S20 | Diablo |
|---|---|---|
| Tyre Reviews owners | 82 | 74 |
Scores at a glance
| Category | Bridgestone S20 | Pirelli Diablo |
|---|---|---|
| Relative Score | 70 | 78 |
| Dry | 82 | 73 |
| Wet | 72 | 79 |
| Comfort | 80 | 79 |
| Treadwear | 50 | 83 |
| Handling | 82 | 74 |
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
70
/ 100
Tire A
78
/ 100
Tire B
From owners
Pros, cons & observations
Themes extracted from owner reviews across retailers and review sites — not the opinion of TireWheelGuide.
The Bridgestone S20 is widely regarded as a high-performance tire that excels in grip and handling, offering riders exceptional confidence in both wet and dry conditions. However, this performance comes at the cost of rapid tread wear, with many users reporting significantly shorter lifespans compared to sport-touring alternatives.
Pros
- Exceptional grip levels in both wet and dry conditions
- Progressive and predictable handling characteristics
- Strong performance during aggressive road riding and track use
- Quick turn-in and confidence-inspiring feedback
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
- High frequency of replacement leading to increased long-term costs
Observations
- High-torque motorcycles like the ZZR1400 experience extremely rapid rear tire wear, often requiring replacement in under 2,000 miles.
- Riders of lighter, agile bikes like the SV650 report better satisfaction with the tire's profile and handling characteristics.
- Track-focused riders noted that while the tire performs well under heavy load, it can shred quickly during intensive track sessions.
The Pirelli Diablo is widely regarded as a reliable, high-value sport-touring tire that excels in providing consistent grip and confidence for daily commuting and spirited road riding. While users praise its predictable handling and wet-weather performance, the consensus notes a trade-off in longevity, with many riders experiencing significant rear tire wear within 4,000 to 5,000 miles.
Pros
- Excellent dry grip once the tire reaches operating temperature
- Inspiring feedback and planted handling for confident cornering
- Strong performance in wet weather conditions
- High value-for-money proposition compared to premium racing-focused rubber
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
- Tendency to pick up road debris and grit due to the soft compound
Observations
- Riders on middleweight sportbikes like the CB650F and SV650 report high satisfaction for commuting and touring applications.
- Aggressive riders on high-performance machines like the CBR600RR note that while the tire is excellent for daily use, it lacks the ultimate edge-grip required for track-day knee-down riding compared to dedicated summer or race-compound tires.
Specifications
Specs side by side
| Attribute | A · Bridgestone S20 | B · Pirelli Diablo |
|---|---|---|
| Category | Summer Extreme Performance tires | Summer High Performance tires |
| Vehicle type | Motorcycle | Motorcycle |
Final verdict
Which one should you actually buy?
70
/ 100
Bridgestone
78
/ 100
Pirelli
Winner: Pirelli Diablo — better treadwear and wet. Pick the Bridgestone S20 if dry and handling matter most to you.
Pick tire B
You want the longest tread life
Pirelli Diablo scores 83 vs 50 on treadwear.
Pick tire A
You want the most grip on dry roads
Bridgestone S20 scores 82 vs 73 on dry.
Pick tire A
You enjoy sharp, responsive handling
Bridgestone S20 scores 82 vs 74 on handling.
Pick tire B
Your priority is wet-weather safety
Pirelli Diablo scores 79 vs 72 on wet.
Tire A · Bridgestone S20
Tire B · Pirelli Diablo
More comparisons
Also compared with
Bridgestone S20 also compared with
Pirelli Diablo also compared with
How do we compare tires?
Every category score blends two independent signals. 60% comes from professional tire tests (braking distances, lap times, noise measurements) normalized against the best tire in each test and weighted toward recent tests. 40% comes from thousands of owner reviews collected from retailers and review sites. When a tire has only one of the two, we use what exists and say so.
Community buzz from Reddit and forums is shown for context only — it never changes the score.