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Bridgestone Battlax BT 021 vs Pirelli Diablo Rosso IV — Compared

Relative Score (0–100): 60% professional tests, 40% owner reviews.

Diablo Rosso IV is ahead, 76–66

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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.

  1. 68

    Dry

    Diablo Rosso IV +7
    75
    Why this score
    SourceBattlax BT 021Diablo Rosso IV
    Professional tests (TWG score)–68
    Reviews found online6887
  2. 67

    Wet

    Diablo Rosso IV +13
    80
    Why this score
    SourceBattlax BT 021Diablo Rosso IV
    Professional tests (TWG score)–81
    Reviews found online6680
  3. 67

    Comfort

    Diablo Rosso IV +8
    75
    Why this score
    SourceBattlax BT 021Diablo Rosso IV
    Reviews found online6681
  4. 65

    Treadwear

    Diablo Rosso IV +1
    66
    Why this score
    SourceBattlax BT 021Diablo Rosso IV
    Reviews found online6566
  5. 65

    Handling

    Diablo Rosso IV +22
    87
    Why this score
    SourceBattlax BT 021Diablo Rosso IV
    Reviews found online6587
Scores at a glance
CategoryBridgestone Battlax BT 021Pirelli Diablo Rosso IV
Relative Score 66 76
Dry 68 75
Wet 67 80
Comfort 67 75
Treadwear 65 66
Handling 65 87

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

Weight the categories that matter to you

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

Battlax BT 021

Diablo Rosso IV

Pros, cons & observations

Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.

Tire A Battlax BT 021

Pros

  • Exceptional tread longevity and durability for high-mileage commuters
  • Reliable performance for motorway and long-distance riding
  • Strong grip characteristics when tire pressures are correctly calibrated

Cons

  • Handling characteristics can feel unpredictable or heavy if pressures are not perfectly matched to the bike
  • Reports of poor wet-weather grip and lack of rider feedback
  • Tendency for the center of the tire to flatten out significantly during high-mileage motorway use
All owner themes in the Battlax BT 021 review

Tire B Diablo Rosso IV

Pros

  • Exceptional dry and wet grip with a high level of rider confidence
  • Fast warm-up time and predictable handling at deep lean angles
  • Improved steering precision and turn-in compared to previous generations like the Diablo Rosso III

Cons

  • Higher price point compared to some competitors and previous models
  • Noticeable reduction in grip and increased rear wheel spin as the tires wear down
  • Requires full operating temperature for optimal performance late in its life cycle
All owner themes in the Diablo Rosso IV review

Specs side by side

Attribute A · Bridgestone Battlax BT 021 B · Pirelli Diablo Rosso IV
CategorySummerSummer
Vehicle typeMotorcycleMotorcycle

Which one should you actually buy?

Bridgestone Battlax BT 021

Pirelli Diablo Rosso IV

Winner: Pirelli Diablo Rosso IV — better handling, wet and comfort. It leads or ties in every category we score.

Pick tire B You enjoy sharp, responsive handling

Pirelli Diablo Rosso IV scores 87 vs 65 on handling.

Pick tire B Your priority is wet-weather safety

Pirelli Diablo Rosso IV scores 80 vs 67 on wet.

Pick tire B You want the most comfortable ride

Pirelli Diablo Rosso IV scores 75 vs 67 on comfort.

Pick tire B You want the most grip on dry roads

Pirelli Diablo Rosso IV scores 75 vs 68 on dry.

Tire A · Bridgestone Battlax BT 021
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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), 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.

76

Leads

Diablo Rosso IV

Amazon