Thunderer · tire line
Thunderer EXTENSA AS II: treadwear rating & UTQG grades
Grade summary
Key facts
| Treadwear (NHTSA UTQG) | 620median · range 620 · band 600 and up |
|---|---|
| Traction grade(s) | Traction A |
| Temperature grade(s) | Temp A |
| Percentile (all lines) | Median treadwear higher than 90% of 3,020 lines |
| Rank within Thunderer | #2 of 36 rated lines (by median treadwear) |
| NHTSA records | 6 total; 6 name a specific size (6 distinct sizes) |
| Warranty miles | Not shown (no maker-published figure verified) |
| Price | Not shown (varies by size and store); see “Where to buy” |
What these grades mean in plain English
- Treadwear 620: this is a very high treadwear grade, the top end of the UTQG scale. Under UTQG a grade of 200 should wear twice as long as the grade-100 control tire on NHTSA's test course; real-world mileage varies with driving, rotation, alignment and climate.
- Traction A: A: second-highest wet-braking grade. Traction is straight-ahead wet braking only; it does not measure cornering or hydroplaning.
- Temperature A: A (highest): resisted heat build-up through the higher 575 rpm test stage.
- Ranked just above in Thunderer: 800 ULTRA (median 700).
- Ranked just below in Thunderer: Celsius II (median 560).
NHTSA records for Thunderer EXTENSA AS II
Each row is one NHTSA record as filed by the manufacturer. Sizes are shown exactly as NHTSA lists them; entries such as “All sizes” apply a single grade to several sizes and cannot be matched to one specific size.
| Size (as filed) | Treadwear | Traction | Temperature |
|---|---|---|---|
| 195/60R15 88H | 620 | Traction A | Temp A |
| 195/65R15 91H | 620 | Traction A | Temp A |
| 205/55R16 91H | 620 | Traction A | Temp A |
| 205/60R16 92H | 620 | Traction A | Temp A |
| 205/65R15 94H | 620 | Traction A | Temp A |
| 205/65R16 95H | 620 | Traction A | Temp A |
Compare this line with others in the same size: 195/60R15, 195/65R15, 205/55R16, 205/60R16, 205/65R15, 205/65R16.
Cost-per-mile calculator
Price and mileage data are pending a licensed feed, so nothing is pre-filled. Enter your own quote and your own mileage expectation (for example the maker's treadwear warranty from the tire's paperwork). Formula: cost per 1,000 miles = price per set ÷ (expected miles ÷ 1,000).
Other Thunderer lines by treadwear
| Rank | Line | Median treadwear |
|---|---|---|
| 1 | 800 ULTRA | 700Treadwear |
| 2 | EXTENSA AS II (this page) | 620Treadwear |
| 3 | Celsius II | 560Treadwear |
| 4 | R601 | 560Treadwear |
| 5 | R404 | 540Treadwear |
| 6 | CELSIUS CUV | 520Treadwear |
| 7 | EXTENSA A/S | 490Treadwear |
| 8 | AMERICA SELECTA PUS | 460Treadwear |
| 9 | Corona | 460Treadwear |
| 10 | Deportiva | 460Treadwear |
| 11 | Direccional | 460Treadwear |
| 12 | SE 65 SERIES | 460Treadwear |
Similar treadwear from other brands
Other lines in the same treadwear band (600–699) with a page here: Cyclone Ultra Tour (TR) (620), Grand Spirit Touring Sli (620), Hankook Optimo H725 (OE) (620), Michelin Latitude Tour (620), Mohawk GRAND TOUR SLi (620), Tigar EXTENSA AS II (620).
Guides that explain these numbers
- What does a tire treadwear rating mean?UTQG basics
- Treadwear rating vs. mileage warrantyTreadwear vs. mileage
- How to make your tires last longerMaintenance
FAQ
What is the treadwear rating of the Thunderer EXTENSA AS II?
NHTSA's UTQG data lists a single treadwear grade of 620 for the Thunderer EXTENSA AS II, from 6 records. Treadwear is graded in multiples of 20 relative to a government control tire graded 100; it is not a mileage guarantee.
Is the Thunderer EXTENSA AS II treadwear grade high or low?
A grade of 620 is a very high treadwear grade, the top end of the UTQG scale. Compared with every line in the NHTSA data, the median is higher than 90% of lines (dataset median 420). Within Thunderer it ranks #2 of 36.
What is the cost per mile of the Thunderer EXTENSA AS II?
We do not have a licensed price or warranty-mileage feed yet, so we do not state a cost per mile. Use the formula cost per 1,000 miles = price per set ÷ (expected miles ÷ 1,000) with your own quote and mileage expectation, or the calculator on this page.
Source and caveats
Source: NHTSA tire ratings API, pulled 2026-10-25. Grade definitions: NHTSA TireWise and 49 CFR 575.104. Grades are self-reported by manufacturers. The NHTSA data has no “currently sold” flag (its active field is false on every record), so a listed line may be discontinued. See methodology.