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Michelin
Michelin Pilot Sport Cup 2 315/30ZR21XL 105(Y) - 15531
Michelin Pilot Sport Cup 2 315/30ZR21XL 105(Y) - 15531
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The Michelin Pilot Sport Cup 2 in 315/30R21 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.
What 315/30R21 means
In the size 315/30R21, 315 is the section width in millimeters (12.40 in), 30 is the aspect ratio — the sidewall stands 30% as tall as the tire is wide, or 94.5 mm (3.72 in) — R denotes radial construction, and 21 is the wheel diameter in inches. That works out to an overall diameter of about 28.44 inches, turning roughly 709 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 105 — a maximum load of 2,039 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 | 315/30ZR21XL |
| Tire Type | Summer |
| Service Description | 105Y |
| Load Index | 105 |
| Speed Rating | Y |
| Load Range | Extra Load |
| Section Width (mm) | 315 |
| Aspect Ratio | 30 |
| Overall Diameter (in) | 28.5 |
| Tread Depth (/32") | 7.2 |
| Treadwear | 180 |
| Traction Grade | AA |
| Temperature Grade | A |
| UTQG | 180AAA |
Frequently asked questions
What does 105Y mean on the Michelin Pilot Sport Cup 2?
105Y breaks down as load index 105 — rated for 2,039 lbs per tire — with a Y speed rating, good for a maximum sustained 186 mph.
What kind of tire is the Michelin Pilot Sport Cup 2?
The Michelin Pilot Sport Cup 2 in 315/30R21 is a summer tire.
What are the treadwear and warranty ratings on the Michelin Pilot Sport Cup 2?
This tire carries a treadwear grade of 180, traction grade AA, temperature grade A under UTQG.
Keep shopping
Browse Michelin tires, see every Michelin Pilot Sport Cup 2 size, or view all tires at ThreePiece.us.
- BRAND:
- Michelin
- Model:
- Pilot Sport Cup 2
- Size:
- 315/30ZR21XL
- Aspect Ratio:
- 30
- Load Index:
- 105
- Load Range:
- Extra Load
- Section Width:
- 315
- Service Description:
- 105Y
- Speed Index:
- Y
- Temperature:
- A
- Tire Rim Diameter:
- 28.5
- Tire Type:
- Summer
- Traction:
- AA
- Tread Wear:
- 180
- Tread Depth:
- 7.2
- UQTG:
- 180AAA
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