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Hankook
Hankook Smart Flex TH31 245/70R17.5/18 143/141J - 3003746
Hankook Smart Flex TH31 245/70R17.5/18 143/141J - 3003746
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Shop the Hankook Smart Flex TH31 245/70R17.5 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
What 245/70R17.5 means
In the size 245/70R17.5, 245 is the section width in millimeters (9.65 in), 70 is the aspect ratio — the sidewall stands 70% as tall as the tire is wide, or 171.5 mm (6.75 in) — R denotes radial construction, and 17.5 is the wheel diameter in inches. That works out to an overall diameter of about 31.00 inches, turning roughly 651 revolutions per mile. Overall diameter is what matters for speedometer accuracy and clearance when you change sizes, so compare it — not just the width — against your current tire.
The manufacturer lists the overall diameter of this specific tire as 31.46 inches — when clearance is tight, go by the published figure rather than the nominal size math.
The service description on this tire decodes to a load index of 143 — a maximum load of 6,008 lbs per tire, or 141 (5,677 lbs) per tire when mounted as duals. The speed symbol J corresponds to a maximum sustained speed of 62 mph.
Load Range J corresponds to a 18-ply rating.
Specifications
| Size | 245/70R17.5/18 |
| Service Description | 143/141J |
| Load Index | 143/141 |
| Speed Rating | J |
| Load Range | J |
| Section Width (mm) | 245 |
| Aspect Ratio | 70 |
| Overall Diameter (in) | 31.46 |
| Tread Depth (/32") | 15.7 |
Frequently asked questions
How fast does this tire ship?
Every order at ThreePiece.us ships free, with fast delivery from a nationwide warehouse network. Affirm financing is available at checkout.
What does 143/141J mean on the Hankook Smart Flex TH31?
143/141J breaks down as load index 143 — rated for 6,008 lbs per tire (141, or 5,677 lbs, in dual fitment) — with a J speed rating, good for a maximum sustained 62 mph.
Will 245/70R17.5 tires fit my vehicle?
Check the size molded into your current tire's sidewall or the tire placard inside the driver's door jamb — if it reads 245/70R17.5, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right.
Keep shopping
Browse Hankook tires, see every Hankook Smart Flex TH31 size, or view all tires at ThreePiece.us.
- Brand:
- Hankook
- Model:
- Smart Flex TH31
- Size:
- 245/70R17.5/18
- Aspect Ratio:
- 70
- Load Index:
- 143/141
- Load Range:
- J
- Section Width:
- 245
- Service Description:
- 143/141J
- Speed Index:
- J
- Tire Rim Diameter:
- 31.46
- Tread Depth:
- 15.7
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