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Yokohama
Yokohama YOK AD08R 225/40R18
Yokohama YOK AD08R 225/40R18
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Looking for a 225/40R18 extreme performance tire? The Yokohama AD08R is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.
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 88 — a maximum load of 1,235 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.
Specifications
| Size | 225/40R18 |
| Tire Type | Extreme Performance |
| Service Description | 88W |
| Load Index | 88 |
| Speed Rating | W |
| Load Range | SL |
| Section Width (mm) | 225 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 18 |
| Tread Depth (/32") | 9 |
| Treadwear | 200 |
| Traction Grade | AA |
| Temperature Grade | A |
| UTQG | 200AAA |
Frequently asked questions
What kind of tire is the Yokohama AD08R?
The Yokohama AD08R in 225/40R18 is a extreme performance tire.
What are the treadwear and warranty ratings on the Yokohama AD08R?
This tire carries a treadwear grade of 200, traction grade AA, temperature grade A under UTQG.
What does 88W mean on the Yokohama AD08R?
88W breaks down as load index 88 — rated for 1,235 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.
Keep shopping
Shop all 225/40R18 tires, see every Yokohama AD08R size, or view all tires at ThreePiece.us.
- BRAND:
- Yokohama
- Model:
- YOK AD08R
- Size:
- 225/40R18
- Aspect Ratio:
- 40
- Load Index:
- 88
- Load Range:
- SL
- Section Width:
- 225
- Service Description:
- 88W
- Speed Index:
- W
- Temperature:
- A
- Tire Rim Diameter:
- 18
- Tire Type:
- Extreme Performance
- Traction:
- AA
- Tread Wear:
- 200
- Tread Depth:
- 9
- UQTG:
- 200AAA
- Warranty:
- N/A
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