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Michelin
Michelin Pilot Sport EV 255/40R21XL 102Y - 10305
Michelin Pilot Sport EV 255/40R21XL 102Y - 10305
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Looking for a 255/40R21 summer tire? The Michelin Pilot Sport EV is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.
What 255/40R21 means
In the size 255/40R21, 255 is the section width in millimeters (10.04 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 102.0 mm (4.02 in) — R denotes radial construction, and 21 is the wheel diameter in inches. That works out to an overall diameter of about 29.03 inches, turning roughly 695 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 102 — a maximum load of 1,874 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 | 255/40R21XL |
| Tire Type | Summer |
| Service Description | 102Y |
| Load Index | 102 |
| Speed Rating | Y |
| Load Range | Extra Load |
| Section Width (mm) | 255 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 29 |
| Tread Depth (/32") | 8.5 |
| Treadwear | 220 |
| Traction Grade | A |
| Temperature Grade | A |
| UTQG | 220AA |
| Warranty | 20K |
Frequently asked questions
What kind of tire is the Michelin Pilot Sport EV?
The Michelin Pilot Sport EV in 255/40R21 is a summer tire.
What are the treadwear and warranty ratings on the Michelin Pilot Sport EV?
This tire carries a treadwear grade of 220, traction grade A, temperature grade A under UTQG. The manufacturer's warranty is 20K.
What does 102Y mean on the Michelin Pilot Sport EV?
102Y breaks down as load index 102 — rated for 1,874 lbs per tire — with a Y speed rating, good for a maximum sustained 186 mph.
Keep shopping
Shop all 255/40R21 tires, browse Michelin tires, see every Michelin Pilot Sport EV size, or view all tires at ThreePiece.us.
- BRAND:
- Michelin
- Model:
- Pilot Sport EV
- Size:
- 255/40R21XL
- Aspect Ratio:
- 40
- Load Index:
- 102
- Load Range:
- Extra Load
- Section Width:
- 255
- Service Description:
- 102Y
- Speed Index:
- Y
- Temperature:
- A
- Tire Rim Diameter:
- 29
- Tire Type:
- Summer
- Traction:
- A
- Tread Wear:
- 220
- Tread Depth:
- 8.5
- UQTG:
- 220AA
- Warranty:
- 20K
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