Accelera Iota ST68 315/35R21

The Accelera Iota ST68 in 315/35R21 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.

What 315/35R21 means

In the size 315/35R21, 315 is the section width in millimeters (12.40 in), 35 is the aspect ratio — the sidewall stands 35% as tall as the tire is wide, or 110.2 mm (4.34 in) — R denotes radial construction, and 21 is the wheel diameter in inches. That works out to an overall diameter of about 29.68 inches, turning roughly 679 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 111 — a maximum load of 2,403 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.

Specifications

Frequently asked questions

What does 111W mean on the Accelera Iota ST68?

111W breaks down as load index 111 — rated for 2,403 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.

Will 315/35R21 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 315/35R21, 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.

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