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Head-to-head Updated September 2026

Bridgestone Battlax Hypersport S21 vs Pirelli Diablo Rosso IV — Compared (September 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
Tire B Pirelli

Pirelli Diablo Rosso IV

Summer Max Performance tires

Pirelli Diablo Rosso IV tread pattern
Objective (60%)
70/100
1 professional test
User signal (40%)
87/100
7 owner reviews
Dry
89
Wet
72
Comfort
86
Treadwear
76
Handling
91
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VerdictToo close to call: Bridgestone Battlax Hypersport S21 and Pirelli Diablo Rosso IV are within 2 points overall. Bridgestone Battlax Hypersport S21 is stronger on wet, dry and handling. Pirelli Diablo Rosso IV is stronger on treadwear and comfort.
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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

Weight: Neutral
Score (0–100) Battlax Hypersport S21 leads by 6
A
95
B
89
Why this score
SourceBattlax Hypersport S21Diablo Rosso IV
Professional tests (TWG score) – 87
Tyre Reviews owners 95 93

Wet

Weight: Important
Score (0–100) Battlax Hypersport S21 leads by 8
A
80
B
72
Why this score
SourceBattlax Hypersport S21Diablo Rosso IV
Professional tests (TWG score) – 67
Tyre Reviews owners 80 79

Comfort

Weight: Neutral
Score (0–100) Diablo Rosso IV leads by 3
A
83
B
86
Why this score
SourceBattlax Hypersport S21Diablo Rosso IV
Tyre Reviews owners 83 86

Treadwear

Weight: Important
Score (0–100) Diablo Rosso IV leads by 13
A
63
B
76
Why this score
SourceBattlax Hypersport S21Diablo Rosso IV
Tyre Reviews owners 63 76

Handling

Weight: Neutral
Score (0–100) Battlax Hypersport S21 leads by 4
A
95
B
91
Why this score
SourceBattlax Hypersport S21Diablo Rosso IV
Tyre Reviews owners 95 91
DriverReviews owners – 92

Scores at a glance

CategoryBridgestone Battlax Hypersport S21Pirelli Diablo Rosso IV
Relative Score 81 81
Dry 95 89
Wet 80 72
Comfort 83 86
Treadwear 63 76
Handling 95 91

Higher is better. The Relative Score follows your weights below; category scores do not change.

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Recomputed
Headline score

Tire A

Tire B

From owners

Pros, cons & observations

Themes extracted from owner reviews across retailers and review sites — not the opinion of TireWheelGuide.

Tire A Bridgestone Battlax Hypersport S21

The Bridgestone Battlax Hypersport S21 is widely regarded as a high-performance tire that excels in grip and handling, making it a favorite for aggressive street riding and occasional track use. While users praise its quick warm-up and confidence-inspiring cornering, the trade-off is a relatively short tread life, particularly for riders who spend significant time on straight roads.

Pros

  • Exceptional dry grip and cornering stability
  • Rapid warm-up time
  • High performance capability suitable for track days
  • Predictable and communicative road feel

Cons

  • Limited tread longevity
  • Rapid wear on the center compound during straight-line riding
  • Reduced traction on painted road markings and pedestrian crossings

Observations

  • Riders transitioning from 190/50 to 190/55 profiles on sportbikes like the Yamaha R1 report improved handling characteristics.
  • The tire is specifically noted for its suitability on high-demand, high-horsepower sportbikes.
Tire B Pirelli Diablo Rosso IV

The Pirelli Diablo Rosso IV is widely regarded as a top-tier hypersport tire that offers significant improvements in feedback, warm-up time, and lean-angle confidence over its predecessors. While users consistently praise its performance in both wet and dry conditions, the consensus notes that these gains come at a premium price point and with potential longevity trade-offs depending on riding style.

Pros

  • Exceptional dry and wet grip with rapid warm-up times.
  • High level of precision and confidence at deep lean angles.
  • Improved feedback and stability compared to previous generations (DR2/DR3).
  • Surprisingly good low-speed stability and handling characteristics.

Cons

  • Higher price point compared to competitors and previous models.
  • Performance consistency may degrade as the tire reaches the end of its service life.
  • Potential for increased wear rates under aggressive riding conditions.

Observations

  • Users reported significant improvements in resistance to cupping on smaller displacement bikes (e.g., PCX 125) compared to the Diablo Rosso II.
  • Aggressive riders utilizing standard sportbike sizes (120/70 and 190/55) report that the tire maintains performance characteristics comparable to more track-focused compounds like the Rosso Corsa II.
Specifications

Specs side by side

Attribute A · Bridgestone Battlax Hypersport S21 B · Pirelli Diablo Rosso IV
CategorySummer Extreme Performance tiresSummer Max Performance tires
Vehicle typeMotorcycleMotorcycle
Final verdict

Which one should you actually buy?

Bridgestone

Pirelli

Too close to call: Bridgestone Battlax Hypersport S21 and Pirelli Diablo Rosso IV are within 2 points overall. Bridgestone Battlax Hypersport S21 is stronger on wet, dry and handling. Pirelli Diablo Rosso IV is stronger on treadwear and comfort.

Pick tire B You want the longest tread life

Pirelli Diablo Rosso IV scores 76 vs 63 on treadwear.

Pick tire A Your priority is wet-weather safety

Bridgestone Battlax Hypersport S21 scores 80 vs 72 on wet.

Pick tire A You want the most grip on dry roads

Bridgestone Battlax Hypersport S21 scores 95 vs 89 on dry.

Pick tire A You enjoy sharp, responsive handling

Bridgestone Battlax Hypersport S21 scores 95 vs 91 on handling.

Tire A · Bridgestone Battlax Hypersport S21
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Tire B · Pirelli Diablo Rosso IV
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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) 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.