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Nexen
Nexen NEX N'Fera SU1 225/40R18/4
Nexen NEX N'Fera SU1 225/40R18/4
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Shop the Nexen N'Fera SU1 225/40R18 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
What 225/40R18 means
In the size 225/40R18, 225 is the section width in millimeters (8.86 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 90.0 mm (3.54 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 25.09 inches, turning roughly 804 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 18 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 92 — a maximum load of 1,389 lbs per tire. The speed symbol Y corresponds to a maximum sustained speed of 186 mph.
Specifications
| Size | 225/40R18/4 |
| Tire Type | High Performance |
| Service Description | 92Y |
| Load Index | 92 |
| Speed Rating | Y |
| Load Range | XL |
| Section Width (mm) | 225 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 18 |
| Tread Depth (/32") | 9 |
| Treadwear | 300 |
| Traction Grade | AA |
| Temperature Grade | A |
| UTQG | 300AAA |
| Warranty | 25K |
Frequently asked questions
What are the treadwear and warranty ratings on the Nexen N'Fera SU1?
This tire carries a treadwear grade of 300, traction grade AA, temperature grade A under UTQG. The manufacturer's warranty is 25K.
What does 92Y mean on the Nexen N'Fera SU1?
92Y breaks down as load index 92 — rated for 1,389 lbs per tire — with a Y speed rating, good for a maximum sustained 186 mph.
What kind of tire is the Nexen N'Fera SU1?
The Nexen N'Fera SU1 in 225/40R18 is a high performance tire.
Keep shopping
Shop all 225/40R18 tires, see every Nexen N'Fera SU1 size, or view all tires at ThreePiece.us.
- BRAND:
- Nexen
- Model:
- NEX N'Fera SU1
- Size:
- 225/40R18/4
- Aspect Ratio:
- 40
- Load Index:
- 92
- Load Range:
- XL
- Section Width:
- 225
- Service Description:
- 92Y
- Speed Index:
- Y
- Temperature:
- A
- Tire Rim Diameter:
- 18
- Tire Type:
- High Performance
- Traction:
- AA
- Tread Wear:
- 300
- Tread Depth:
- 9
- UQTG:
- 300AAA
- Warranty:
- 25K
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