Write a Review
Arroyo
Arroyo Grand Sport AS 315/30ZR21
Arroyo Grand Sport AS 315/30ZR21
📧 Get Fitment Help
Verify parts fit & get product recommendations
Lease-to-own for as low as
/week
Get Started
Guaranteed to Fit — confirm your size with the fitment checker on this page
Price Match Guarantee Learn More
Free Mount & Balance
Free Shipping
IN STOCK (134 wheels)
📧 Get Fitment Help
Verify parts fit & get product recommendations
Shop the Arroyo Grand Sport AS 315/30R21 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
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 manufacturer lists the overall diameter of this specific tire as 21 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 105 — a maximum load of 2,039 lbs per tire. The speed symbol Y corresponds to a maximum sustained speed of 186 mph.
Specifications
| Size | 315/30ZR21 |
| Tire Type | Passenger |
| Service Description | 105Y |
| Load Index | 105 |
| Speed Rating | Y |
| Load Range | XL |
| Section Width (mm) | 315 |
| Aspect Ratio | 30 |
| Overall Diameter (in) | 21 |
| Treadwear | 500 |
| Traction Grade | A |
| Temperature Grade | A |
| UTQG | 500 A A |
Frequently asked questions
What are the treadwear and warranty ratings on the Arroyo Grand Sport AS?
This tire carries a treadwear grade of 500, traction grade A, temperature grade A under UTQG.
What does 105Y mean on the Arroyo Grand Sport AS?
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 Arroyo Grand Sport AS?
The Arroyo Grand Sport AS in 315/30R21 is a passenger tire.
Keep shopping
See every Arroyo Grand Sport AS size, or view all tires at ThreePiece.us.
- BRAND:
- Arroyo
- Model:
- Grand Sport AS
- Size:
- 315/30ZR21
- Aspect Ratio:
- 30
- Load Index:
- 105
- Load Range:
- XL
- Section Width:
- 315
- Service Description:
- 105Y
- Speed Index:
- Y
- Temperature:
- A
- Tire Rim Diameter:
- 21
- Tire Type:
- Passenger
- Traction:
- A
- Tread Wear:
- 500
- Max Load (LB):
- N/A
- UQTG:
- 500 A A
- Side Wall:
- BSW
- Warranty:
- N/A
PRODUCT REVIEWS (0)
Overall Rankings
Have you tried this product?
WRITE A REVIEWNo reviews for this product yet. Be the first to write a review!
Write a Review