90
/ 100
Objective (60%)
–/100
No test data yet
User signal (40%)
88/100
13 owner reviews
Prices change daily — check the retailer for your size.
Head-to-head
Updated September 2026
Avon Spirit ST 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
81
/ 100
Objective (60%)
70/100
1 professional test
User signal (40%)
87/100
7 owner reviews
Prices change daily — check the retailer for your size.
VerdictWinner: Avon Spirit ST — better wet, treadwear and dry. Pick the Pirelli Diablo Rosso IV if handling matters 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)
Spirit ST leads by 5
Why this score
| Source | Spirit ST | Diablo Rosso IV |
|---|---|---|
| Professional tests (TWG score) | – | 87 |
| Tyre Reviews owners | 94 | 93 |
Wet
Score (0–100)
Spirit ST leads by 26
Why this score
| Source | Spirit ST | Diablo Rosso IV |
|---|---|---|
| Professional tests (TWG score) | – | 67 |
| Tyre Reviews owners | 98 | 79 |
Comfort
Score (0–100)
Diablo Rosso IV leads by 1
Why this score
| Source | Spirit ST | Diablo Rosso IV |
|---|---|---|
| Tyre Reviews owners | 85 | 86 |
Treadwear
Score (0–100)
Spirit ST leads by 9
Why this score
| Source | Spirit ST | Diablo Rosso IV |
|---|---|---|
| Tyre Reviews owners | 85 | 76 |
Handling
Score (0–100)
Diablo Rosso IV leads by 4
Why this score
| Source | Spirit ST | Diablo Rosso IV |
|---|---|---|
| Tyre Reviews owners | 87 | 91 |
| DriverReviews owners | – | 92 |
Scores at a glance
| Category | Avon Spirit ST | Pirelli Diablo Rosso IV |
|---|---|---|
| Relative Score | 90 | 81 |
| Dry | 94 | 89 |
| Wet | 98 | 72 |
| Comfort | 85 | 86 |
| Treadwear | 85 | 76 |
| Handling | 87 | 91 |
Higher is better. The Relative Score follows your weights below; category scores do not change.
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Recomputed
Headline score
90
/ 100
Tire A
81
/ 100
Tire B
From owners
Pros, cons & observations
Themes extracted from owner reviews across retailers and review sites — not the opinion of TireWheelGuide.
The Avon Spirit ST is widely regarded as a high-performance sport-touring tire that offers exceptional grip and stability across diverse weather conditions. While most users praise its longevity and value, experiences are polarized, with some riders reporting significant issues regarding handling feedback and high-speed vibrations on specific heavy motorcycles.
Pros
- Excellent wet and dry weather grip
- High durability and resistance to squaring off
- Strong value proposition compared to premium competitors
- High stability under heavy loads and two-up riding
Cons
- Reports of vague steering feedback and reluctance to turn on certain bikes
- Inconsistent quality control leading to high-speed vibrations for some users
- Poor customer support resolution for warranty claims
- Extremely short tread life reported by a minority of users
Observations
- Users on heavy touring bikes like the BMW K1600GT reported significant high-speed vibration issues.
- Riders of mid-sized motorcycles like the Yamaha 700 noted improved stability and predictability compared to previous tires.
- Heavy-duty touring and two-up riding configurations consistently reported positive results regarding tire longevity and load stability.
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 · Avon Spirit ST | B · Pirelli Diablo Rosso IV |
|---|---|---|
| Category | Summer Premium Touring tires | Summer Max Performance tires |
| Vehicle type | Motorcycle | Motorcycle |
Final verdict
Which one should you actually buy?
90
/ 100
Avon
81
/ 100
Pirelli
Winner: Avon Spirit ST — better wet, treadwear and dry. Pick the Pirelli Diablo Rosso IV if handling matters most to you.
Pick tire A
Your priority is wet-weather safety
Avon Spirit ST scores 98 vs 72 on wet.
Pick tire A
You want the longest tread life
Avon Spirit ST scores 85 vs 76 on treadwear.
Pick tire A
You want the most grip on dry roads
Avon Spirit ST scores 94 vs 89 on dry.
Pick tire B
You enjoy sharp, responsive handling
Pirelli Diablo Rosso IV scores 91 vs 87 on handling.
Tire A · Avon Spirit ST
Tire B · Pirelli Diablo Rosso IV
More comparisons
Also compared with
Avon Spirit ST also compared with
Pirelli Diablo Rosso IV 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.