Relative Score (0–100): the weighted average of the categories below, each 60% road tests and 40% owner reviews. Based on 0 + 1 road tests and 300 + 42 owner reviews. How we score
HTR Z III leads, 66–64 Narrow edge
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Tests – · none yet Owners 60 · 300 reviews
“I have the Maxx TT on my car for about 1000 Km which included two slalom sessions. I am very pleased with the ride quality and dry traction. It is much quieter than the OEM tires. I have not had a chance to drive in wet road yet.”
Tests – · 1 test Owners 57 · 42 reviews
Best test result: #6 of 22 in 2022 Consumer Reports Ultra High Performance Summer Tires (tested tread life (miles))
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
| Source | SP Sport Maxx TT | HTR Z III |
|---|---|---|
| Professional tests (TWG score) | ≈ 66 (est.) | ≈ 68 (est.) |
| Reviews found online | 65 | 68 |
SP Sport Maxx TT: 60% × 66.5 (est.) + 40% × 64.6 = 66
HTR Z III: 60% × 68 (est.) + 40% × 68.3 = 68
No road tests of dry for SP Sport Maxx TT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.40).
No road tests of dry for HTR Z III. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.40).
| Source | SP Sport Maxx TT | HTR Z III |
|---|---|---|
| Professional tests (TWG score) | ≈ 67 (est.) | ≈ 65 (est.) |
| Reviews found online | 64 | 62 |
SP Sport Maxx TT: 60% × 66.6 (est.) + 40% × 64 = 66
HTR Z III: 60% × 65.5 (est.) + 40% × 62.1 = 64
No road tests of wet for SP Sport Maxx TT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.56).
No road tests of wet for HTR Z III. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.56).
| Source | SP Sport Maxx TT | HTR Z III |
|---|---|---|
| Professional tests (TWG score) | – | ≈ 51 (est.) |
| Reviews found online | – | 12 |
HTR Z III: 60% × 50.8 (est.) + 40% × 12.2 = 35
No road tests of snow for HTR Z III. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.33).
| Source | SP Sport Maxx TT | HTR Z III |
|---|---|---|
| Professional tests (TWG score) | ≈ 66 (est.) | ≈ 68 (est.) |
| Reviews found online | 53 | 65 |
SP Sport Maxx TT: 60% × 66.4 (est.) + 40% × 53.3 = 61
HTR Z III: 60% × 68.5 (est.) + 40% × 65.4 = 67
No road tests of comfort for SP Sport Maxx TT or HTR Z III. The test half is the tested tires’ average (69): owners’ comfort ratings barely follow the road tests.
| Source | SP Sport Maxx TT | HTR Z III |
|---|---|---|
| Professional tests (TWG score) | – | ≈ 67 (est.) |
| Reviews found online | – | 65 |
HTR Z III: 60% × 67.3 (est.) + 40% × 64.6 = 66
No road tests of noise for HTR Z III. The test half is the tested tires’ average (67): owners’ noise ratings barely follow the road tests.
| Source | SP Sport Maxx TT | HTR Z III |
|---|---|---|
| Professional tests (TWG score) · – / 1 tests | ≈ 62 (est.) | 70 |
| Reviews found online | 53 | 60 |
SP Sport Maxx TT: 60% × 61.8 (est.) + 40% × 53.2 = 58
HTR Z III: 60% × 70.2 + 40% × 59.9 = 66
No road tests of treadwear for SP Sport Maxx TT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.31).
| Source | SP Sport Maxx TT | HTR Z III |
|---|---|---|
| Reviews found online | 61 | 67 |
| Category | Dunlop SP Sport Maxx TT | Sumitomo HTR Z III |
|---|---|---|
| Relative Score | 64 | 66 |
| Dry | 66 | 68 |
| Wet | 66 | 64 |
| Snow | – | 35 |
| Comfort | 61 | 67 |
| Noise | – | 66 |
| Treadwear | 58 | 66 |
| Handling (owners) | 61 | 67 |
Higher is better. The Relative Score follows your weights below; category scores do not change.
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.
Only one of the two tires has a score here, so this weight changes nothing in the head-to-head.
Only one of the two tires has a score here, so this weight changes nothing in the head-to-head.
SP Sport Maxx TT
HTR Z III
Only categories both tires have data for count toward the headline score.
Per discipline: the average % of the best tire over every test both tires were in, and how many of those tests each one won. “Different tests” rows compare results from separate tests.
| Discipline | Category | SP Sport Maxx TT | HTR Z III | Δ | Head-to-head |
|---|---|---|---|---|---|
| Also published by the testers (not in the score) | |||||
| Overall Ranking | Overall | #3/14 2011 Auto Zeitung Max Performance Tyre Test | #17/22 2022 Consumer Reports Ultra High Performance Summer Tires | – | Different tests |
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
From Reddit, forums and review threads. Not part of our score
Community members generally praise the Dunlop SP Sport Maxx TT for its quiet road manners, respectable dry and wet grip, and solid track and cold-weather road performance compared to stock competition-oriented tires. Some drivers note relatively soft sidewalls during aggressive slalom events on heavier vehicles or limited grip before coming up to temperature. Overall, drivers find it to be a capable, comfortable summer tire that balances performance and daily drivability.
“We have these tires on my 18 Grand Sport and my wife’s 17 Z51 Convertible driving in Ohio. Very pleased with these tires! Probably should be OEM for these cars. Handle very well. Doesn’t throw gravel up on the cars like stock tires. Cold weather grip is very good! Stock MPSS are scary below 50 degrees. We have had good success with Discount Tire for purchase and install.”
“In Hong Kong, if your style is aggresive, sport maxx is not enough, i am using AD08 and RE11 is not bad”
“After 3 sessions of autoslalom, I can say that the sidewall is too soft for this heavy car. I have the front tires set at 39 psi cool. I may try higher pressure next time to see if it can reduce the tire roll and maintain traction. In term of day to day driving, this is a great quiet summer tire. It performs well in wet too.”
Based on 19 community posts
We haven't collected enough community discussion about this tire yet.
| Attribute | A · Dunlop SP Sport Maxx TT | B · Sumitomo HTR Z III |
|---|---|---|
| Category | Summer | Summer |
| Vehicle type | Passenger Car / Crossover | Passenger Car / Crossover |
| Sizes available | 5 | 1 |
| Rim diameters | 16″ – 18″ | 19″ |
| Tread depth | — | 10/32″ |
| UTQG | — | 300 A A |
| Sidewall | — | Blackwall |
| Max pressure | — | 50 psi |
Dunlop SP Sport Maxx TT
Sumitomo HTR Z III
Narrow edge: Sumitomo HTR Z III — better treadwear, comfort and handling. Where the Dunlop SP Sport Maxx TT is ahead, it is by less than 3 points.
Sumitomo HTR Z III scores 66 vs 58 on treadwear.
Sumitomo HTR Z III scores 67 vs 61 on comfort.
Sumitomo HTR Z III scores 67 vs 61 on handling.
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Neither, by our numbers: 66 vs 64 on the wet score, within 3 points.
Neither, by our numbers: 66 vs 68 on the dry score, within 3 points.
Sumitomo HTR Z III, 67 vs 61 on our comfort score.
Sumitomo HTR Z III, 66 vs 58 on our treadwear score.
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
