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Westlake
Westlake WESTLAKE SL309 215/75R15/6
Westlake WESTLAKE SL309 215/75R15/6
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Shop the Westlake SL309 215/75R15 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
What 215/75R15 means
In the size 215/75R15, 215 is the section width in millimeters (8.46 in), 75 is the aspect ratio — the sidewall stands 75% as tall as the tire is wide, or 161.2 mm (6.35 in) — R denotes radial construction, and 15 is the wheel diameter in inches. That works out to an overall diameter of about 27.70 inches, turning roughly 728 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 15 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 100 — a maximum load of 1,764 lbs per tire, or 97 (1,609 lbs) per tire when mounted as duals. The speed symbol Q corresponds to a maximum sustained speed of 99 mph.
Load Range C corresponds to a 6-ply rating.
Specifications
| Size | 215/75R15/6 |
| Tire Type | High-Performance |
| Service Description | 100/97Q |
| Load Index | 100/97 |
| Speed Rating | Q |
| Load Range | C/6 |
| Section Width (mm) | 215 |
| Aspect Ratio | 75 |
| Overall Diameter (in) | 15 |
| Tread Depth (/32") | 11 |
| Warranty | 40K |
Frequently asked questions
What warranty does the Westlake SL309 carry?
The manufacturer's warranty on this tire is 40K.
What does 100/97Q mean on the Westlake SL309?
100/97Q breaks down as load index 100 — rated for 1,764 lbs per tire (97, or 1,609 lbs, in dual fitment) — with a Q speed rating, good for a maximum sustained 99 mph.
What kind of tire is the Westlake SL309?
The Westlake SL309 in 215/75R15 is a high-performance tire.
Keep shopping
See every Westlake SL309 size, or view all tires at ThreePiece.us.
- BRAND:
- Westlake
- Model:
- WESTLAKE SL309
- Size:
- 215/75R15/6
- Aspect Ratio:
- 75
- Load Index:
- 100/97
- Load Range:
- C/6
- Section Width:
- 215
- Service Description:
- 100/97Q
- Speed Index:
- Q
- Temperature:
- N/A
- Tire Rim Diameter:
- 15
- Tire Type:
- High-Performance
- Traction:
- N/A
- Tread Wear:
- N/A
- Tread Depth:
- 11
- UQTG:
- N/A
- Warranty:
- 40K
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