tirewheelguide
Head-to-head Updated

Avon Spirit ST vs Michelin Power GP — 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 15 + 6 owner reviews. How we score

Spirit ST is ahead, 82–77

Check price on Amazon · Spirit ST or Power GP on Amazon
Add your size for an exact match
/R

Both Amazon links then search this exact size.

TireWheelGuide may earn a commission from purchases made through these links.

Avon Spirit ST
Tire AAvon

Spirit ST

Summer

± 8Provisional

Tests – · none yet Owners 87 · 15 reviews

Michelin Power GP
Tire BMichelin

Power GP

Summer

± 8Provisional

Tests – · none yet Owners 81 · 6 reviews

Category by category

Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.

  1. 82

    Dry

    Spirit ST +3
    79
    Why this score
    SourceSpirit STPower GP
    Professional tests (TWG score)≈ 77 (est.)≈ 75 (est.)
    Reviews found online8986

    Spirit ST: 60% × 76.7 (est.) + 40% × 89.1 = 82

    Power GP: 60% × 75.2 (est.) + 40% × 85.6 = 79

    No road tests of dry for Spirit ST. 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 Power GP. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.41).

  2. 87

    Wet

    Spirit ST +10
    77
    Why this score
    SourceSpirit STPower GP
    Professional tests (TWG score)≈ 83 (est.)≈ 76 (est.)
    Reviews found online9380

    Spirit ST: 60% × 82.9 (est.) + 40% × 93 = 87

    Power GP: 60% × 75.5 (est.) + 40% × 79.5 = 77

    No road tests of wet for Spirit ST. 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 Power GP. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).

  3. 78

    Comfort

    Spirit ST +1
    77
    Why this score
    SourceSpirit STPower GP
    Professional tests (TWG score)≈ 71 (est.)≈ 71 (est.)
    Reviews found online8281

    Spirit ST: 40% × 71.3 (est.) + 60% × 81.9 = 78

    Power GP: 40% × 71.1 (est.) + 60% × 81.1 = 77

    No road tests of comfort for Spirit ST. 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 Power GP. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.20).

  4. 75

    Treadwear

    Spirit ST +3
    72
    Why this score
    SourceSpirit STPower GP
    Professional tests (TWG score)≈ 72 (est.)≈ 70 (est.)
    Reviews found online8075

    Spirit ST: 60% × 71.5 (est.) + 40% × 80.4 = 75

    Power GP: 60% × 69.7 (est.) + 40% × 75.4 = 72

    No road tests of treadwear for Spirit ST. 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 Power GP. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.36).

  5. 87

    Handling (owners)

    Spirit ST +2
    85
    Why this score
    SourceSpirit STPower GP
    Reviews found online8785
Scores at a glance
CategoryAvon Spirit STMichelin Power GP
Relative Score 82 77
Dry 82 79
Wet 87 77
Comfort 78 77
Treadwear 75 72
Handling (owners) 87 85

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
± 8

Spirit ST

± 8

Power GP

Pros, cons & observations

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

Tire A Spirit ST

Pros

  • Excellent grip in dry, cold and wet conditions, with confidence-inspiring braking and wet-weather performance, and capability extending to occasional track use
  • Stable, predictable handling at high speeds and under heavy loads (pillion and luggage), with a comfortable ride and low noise
  • Good tread life reported by several riders, who describe even wear, resistance to squaring off and mileage up to nearly double that of Michelin tyres

Cons

  • Wear complaints from a minority, including one rider who got only about 2,000 km
  • Reluctance to turn in fast direction changes and a lack of feedback from the tyres, according to one reviewer
  • Front tyre vibration and shaking over 60 mph on one BMW K1600GT, which persisted after rebalancing at two garages
All owner themes in the Spirit ST review

Tire B Power GP

Pros

  • Rapid warm-up time providing immediate confidence
  • Exceptional dry grip and predictable feedback
  • Superior performance in damp or wet conditions compared to competitors

Cons

  • Limited tread life, with some users reporting replacement intervals between 5,000 and 6,000 kilometers
  • Potential for uneven wear or cupping on the tire edges
  • High performance focus may not suit riders prioritizing maximum longevity
All owner themes in the Power GP review

Specs side by side

Attribute A · Avon Spirit ST B · Michelin Power GP
CategorySummerSummer
Vehicle typeMotorcycleMotorcycle

Which one should you actually buy?

Avon Spirit ST

Michelin Power GP

Winner: Avon Spirit ST — better wet, dry and treadwear. It leads or ties in every category we score. Avon Spirit ST rests on little evidence so far (0 tests, 15 reviews), so read this result as provisional. Michelin Power GP rests on little evidence so far (0 tests, 6 reviews), so read this result as provisional.

Pick tire A Your priority is wet-weather safety

Avon Spirit ST scores 87 vs 77 on wet.

Pick tire A You want the most grip on dry roads

Avon Spirit ST scores 82 vs 79 on dry.

Pick tire A You want the longest tread life

Avon Spirit ST scores 75 vs 72 on treadwear.

Tire A · Avon Spirit ST
Check price on Amazon
Tire B · Michelin Power GP
Check price on Amazon

TireWheelGuide may earn a commission from purchases made through these links.

Spirit ST or Power GP?

Which is better in the wet, Spirit ST or Power GP?

Avon Spirit ST, 87 vs 77 on our wet score.

Which grips better on dry roads, Spirit ST or Power GP?

Avon Spirit ST, 82 vs 79 on our dry score.

Which is more comfortable, Spirit ST or Power GP?

Neither, by our numbers: 78 vs 77 on the comfort score, within 3 points.

Which lasts longer, Spirit ST or Power GP?

Avon Spirit ST, 75 vs 72 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