Sumitomo · tire line
Sumitomo HTR ENHANCE CX2: treadwear rating & UTQG grades
Grade summary
Key facts
| Treadwear (NHTSA UTQG) | 680median · range 600–680 · band 600 and up |
|---|---|
| Traction grade(s) | Traction A |
| Temperature grade(s) | Temp A |
| Percentile (all lines) | Median treadwear higher than 94% of 3,020 lines |
| Rank within Sumitomo | #5 of 72 rated lines (by median treadwear) |
| NHTSA records | 10 total; 9 name a specific size (9 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 680: 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 Sumitomo: ECHELON ULTRA LST (T rated) (median 680).
- Ranked just below in Sumitomo: ENCOUNTER AT (median 660).
NHTSA records for Sumitomo HTR ENHANCE CX2
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 |
|---|---|---|---|
| 235/55R20 | 680 | Traction A | Temp A |
| 235/65R18 | 680 | Traction A | Temp A |
| 235/70R16 | 680 | Traction A | Temp B |
| 245/55R19 | 680 | Traction A | Temp A |
| 245/60R18 | 680 | Traction A | Temp A |
| 245/65R17 | 680 | Traction A | Temp A |
| 255/60R19 | 680 | Traction A | Temp A |
| 265/40R22 | 680 | Traction A | Temp A |
| 255/65R18 | 600 | Traction A | Temp B |
| All other sizes | 600 | Traction A | Temp A |
Compare this line with others in the same size: 235/65R18, 235/70R16, 245/55R19, 245/60R18, 245/65R17, 255/65R18.
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 Sumitomo lines by treadwear
| Rank | Line | Median treadwear |
|---|---|---|
| 1 | HTR Enhance LX2 (T-rating) | 800Treadwear |
| 2 | HTR ENHANCE L/X "T" (standard load) | 700Treadwear |
| 3 | HTR Enhance LX2 (H-rating) | 700Treadwear |
| 4 | ECHELON ULTRA LST (T rated) | 680Treadwear |
| 5 | HTR ENHANCE CX2 (this page) | 680Treadwear |
| 6 | ENCOUNTER AT | 660Treadwear |
| 7 | HTR Enhance LX2 (V-rated sizes) | 660Treadwear |
| 8 | ENCOUNTER HT2 (H and V rating) | 640Treadwear |
| 9 | ENCOUNTER HT2 (T rating) | 640Treadwear |
| 10 | HTR A/S P03 (H and V rating) | 640Treadwear |
| 11 | HTR ENHANCE CUV (H rating) | 640Treadwear |
| 12 | Tempra Touring TR | 620Treadwear |
Similar treadwear from other brands
Other lines in the same treadwear band (600–699) with a page here: Continental ContiCrossContact LX (680), Cooper ENDEAVOR PLUS (T-rated) (680), Kelly EDGE TOURING PLUS (680), Falken WILDPEAK A/T AT3W (T rating) (660), Bridgestone ECOPIA H/L 422 PLUS (650), Cyclone Ultra Tour (TR) (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 Sumitomo HTR ENHANCE CX2?
NHTSA's UTQG data lists treadwear grades from 600 to 680 (median 680) for the Sumitomo HTR ENHANCE CX2, from 10 records. Treadwear is graded in multiples of 20 relative to a government control tire graded 100; it is not a mileage guarantee.
Is the Sumitomo HTR ENHANCE CX2 treadwear grade high or low?
A grade of 680 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 94% of lines (dataset median 420). Within Sumitomo it ranks #5 of 72.
What is the cost per mile of the Sumitomo HTR ENHANCE CX2?
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.