If you sort every passenger tire in the federal UTQG database by treadwear grade, the top of the table is not a mystery brand or a niche import. Out of the 747 tire lines from 11 major brands in our UTQG grades data table, exactly nine lines grade 800 or higher — and Michelin owns the very top with four lines graded 820: the Defender, Defender T+H, Defender XT, and X-Tour A/S T+H.
Before you take that as a verdict, though, you need to know what an 820 actually is — because it’s a more slippery number than it looks.
How the treadwear number is produced
UTQG treadwear comes from a real, federally specified test: tires are run in a convoy over a monitored public-road course near San Angelo, Texas for 7,200 miles, with tread depth measured at intervals, alongside a government-specified Course Monitoring Tire that serves as the reference. The candidate tire’s projected wear life is expressed relative to that reference: grade 100 means it wore like the reference tire, and a grade of 800 means it’s rated to wear nominally eight times as long under those test conditions. The 7,200 miles are extrapolated outward, not driven to the cords.
So treadwear is a comparative index, not a mileage prediction. There is no formula that turns 820 into a number of miles on your car — your roads, climate, alignment, and driving style move real-world wear by a factor the test can’t capture.
The self-reporting caveat (read this before comparing brands)
Here’s the part that gets left out of most “longest-lasting tires” lists: NHTSA doesn’t grade the tires. Under 49 CFR 575.104, each manufacturer runs the test (or engineering analysis) on its own tires and assigns its own grades; NHTSA’s role is to define the procedure and spot-check compliance. Manufacturers also routinely grade conservatively or strategically — there’s nothing stopping a maker from stamping 600 on a tire that tested at 700.
The practical consequence, which our data table states on every view: treadwear grades are genuinely useful within one brand’s lineup — a Michelin graded 820 really is claimed to outlast a Michelin graded 500 — but cross-brand comparisons are only a rough guide. A 700-graded Hankook and a 700-graded Yokohama were graded against different internal baselines and test batches. Treat the table below as a ranking of manufacturer claims made under a common federal procedure, not as independent lab results.
One more wrinkle from the data itself: a tire line’s grade can differ by size or construction. Where that happens, our table shows the most common grade across the line’s listed sizes and flags the row (“Grade varies by size”). The grade molded into the sidewall of the exact size you buy always governs.
The longest-wearing lines in the database
From the 800+ treadwear view and the top of the full table:
- 820 — Michelin Defender, Defender T+H, Defender XT, X-Tour A/S T+H (traction A, temperature B). The highest treadwear grades in the table, all from Michelin’s touring/all-season Defender family.
- 800 — Michelin Defender LTX and X LT A/S (traction A, temperature A) — the light-truck/SUV counterparts, and notable for pairing an 800 treadwear with an A temperature grade.
- 800 — Bridgestone Dueler H/L Alenza Plus (three speed-rating variants; traction A, temperature A or B depending on variant, and one variant’s grade varies by size). Bridgestone’s SUV touring answer to the Defender LTX.
- 780 — Cooper CS5 Grand Touring (A, B) — the highest grade from a value-tier brand in the table.
- 760 — Pirelli P4 Four Seasons (A, B; grade varies by size).
- 740 — a crowded tier: Goodyear Assurance ComforTred Touring and Assurance TripleTred variants, Cooper Discoverer SRX, Bridgestone Turanza Serenity, and the Pirelli Scorpion Verde All Season Plus (which manages A traction and A temperature at 740).
For scale: the median treadwear grade across all 747 lines is 400, and only 102 lines grade 600 or higher. An 800+ grade puts a tire in roughly the top 1% of the table.
Brand ceilings differ a lot, which is itself informative (with the self-reporting caveat attached): Michelin tops out at 820, Bridgestone at 800, Cooper at 780, Pirelli at 760, Goodyear at 740, Falken at 720, Hankook and Yokohama at 700, Continental and General at 640, and Kumho — at least among the lines captured in this mirror of the database — at 460. You can sort any single brand’s lineup with the per-brand views, e.g. Michelin or Goodyear.
The trade-off the table makes visible: treadwear vs. traction AA
Traction grades wet straight-line stopping distance on government test surfaces: AA (best), A, B, C. It says nothing about dry grip, cornering, or snow. 105 of the 747 lines earn traction AA — and here’s the striking pattern: not one AA-traction line grades above 500 treadwear. The AA ceiling is 500, held by performance-oriented lines like the Bridgestone Potenza RE980AS, Goodyear Eagle F1 Asymmetric All Season, Continental ProContact variants, Cooper Zeon RS3, and Hankook Ventus S1 Noble2. The soft, grippy compounds that stop shortest on wet pavement are the same ones that wear faster. Every 800+ treadwear line grades traction A, not AA. You cannot max out both columns — pick the one that matches how you drive.
Temperature grades resistance to heat buildup at sustained speed: A (best), B, C, with C the legal minimum. It’s the least differentiating of the three — 488 of 747 lines grade temperature A — so treat an A as table stakes rather than a distinction, and a B (as on the 820-graded Defenders) as normal for high-treadwear touring compounds rather than a red flag.
How to actually use these numbers
- Shortlist within a brand using treadwear — that’s where the grades are most trustworthy.
- Across brands, use treadwear as a coarse filter (a 700+ tire and a 300 tire really are different animals; 640 vs. 700 is noise).
- Check the traction grade against your priorities — if wet stopping matters most to you, the AA list and the 800+ list don’t overlap at all.
- Confirm the grade on your exact size before buying; flagged rows in our table vary by size.
- Look at the manufacturer’s mileage warranty alongside the grade — a warranty is a contractual promise with money behind it, which self-assigned grades are not. (Warranties aren’t part of the UTQG database, so they’re not in this table — check the maker’s spec sheet.)
The full sortable table, with per-row provenance and every view linked above, is at Passenger Tire UTQG Grades. For a deeper primer on the grading system itself, see UTQG Tire Grades Explained.