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Michelin
Michelin Pilot Sport 4 285/40R20XL 108Y - 46442
Michelin Pilot Sport 4 285/40R20XL 108Y - 46442
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The Michelin Pilot Sport 4 in 285/40R20 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.
What 285/40R20 means
In the size 285/40R20, 285 is the section width in millimeters (11.22 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 114.0 mm (4.49 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 28.98 inches, turning roughly 696 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 service description on this tire decodes to a load index of 108 — a maximum load of 2,205 lbs per tire. The speed symbol Y corresponds to a maximum sustained speed of 186 mph.
Load Range E corresponds to a 10-ply rating.
Specifications
| Size | 285/40R20XL |
| Tire Type | Summer |
| Service Description | 108Y |
| Load Index | 108 |
| Speed Rating | Y |
| Load Range | Extra Load |
| Section Width (mm) | 285 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 29 |
| Tread Depth (/32") | 9.5 |
| Treadwear | 320 |
| Traction Grade | AA |
| Temperature Grade | A |
| UTQG | 320AAA |
| Warranty | 20K |
Frequently asked questions
What does 108Y mean on the Michelin Pilot Sport 4?
108Y breaks down as load index 108 — rated for 2,205 lbs per tire — with a Y speed rating, good for a maximum sustained 186 mph.
What kind of tire is the Michelin Pilot Sport 4?
The Michelin Pilot Sport 4 in 285/40R20 is a summer tire.
What are the treadwear and warranty ratings on the Michelin Pilot Sport 4?
This tire carries a treadwear grade of 320, traction grade AA, temperature grade A under UTQG. The manufacturer's warranty is 20K.
Keep shopping
Browse Michelin tires, see every Michelin Pilot Sport 4 size, or view all tires at ThreePiece.us.
- BRAND:
- Michelin
- Model:
- Pilot Sport 4
- Size:
- 285/40R20XL
- Aspect Ratio:
- 40
- Load Index:
- 108
- Load Range:
- Extra Load
- Section Width:
- 285
- Service Description:
- 108Y
- Speed Index:
- Y
- Temperature:
- A
- Tire Rim Diameter:
- 29
- Tire Type:
- Summer
- Traction:
- AA
- Tread Wear:
- 320
- Tread Depth:
- 9.5
- UQTG:
- 320AAA
- Warranty:
- 20K
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