Write a Review
Accelera
Accelera Iota ST68 315/30R21
Accelera Iota ST68 315/30R21
📧 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
OUT OF STOCK 
📧 Get Fitment Help
Verify parts fit & get product recommendations
Looking for a 315/30R21 tire? The Accelera Iota ST68 is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.
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 101 — a maximum load of 1,819 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.
Specifications
| Size | 315/30R21 |
| Service Description | 101W |
| Load Index | 101 |
| Speed Rating | W |
| Load Range | XL |
| Section Width (mm) | 315 |
| Aspect Ratio | 30 |
| Temperature Grade | TIRE RIM DIAMETER=21TIRE TYPE=TRACTION=TREAD WEAR=TREAD DEPTH=UQTG=WARRANTY=0 |
Frequently asked questions
Will 315/30R21 tires fit my vehicle?
Check the size molded into your current tire's sidewall or the tire placard inside the driver's door jamb — if it reads 315/30R21, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right.
How fast does this tire ship?
Every order at ThreePiece.us ships free, with fast delivery from a nationwide warehouse network. Affirm financing is available at checkout.
What does 101W mean on the Accelera Iota ST68?
101W breaks down as load index 101 — rated for 1,819 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.
Keep shopping
Browse Accelera tires, see every Accelera Iota ST68 size, or view all tires at ThreePiece.us.
- BRAND:
- Accelera
- MODEL:
- Iota ST68
- SIZE:
- 315/30R21
- ASPECT RATIO:
- 30
- LOAD INDEX:
- 101
- LOAD RANGE:
- XL
- SECTION WIDTH:
- 315
- SERVICE DESCRIPTION:
- 101W
- SPEED INDEX:
- W
- TEMPERATURE:
- TIRE RIM DIAMETER=21TIRE TYPE=TRACTION=TREAD WEAR=TREAD DEPTH=UQTG=WARRANTY=0
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