Hercules Strong Guard C-ST ST225/75R15/12 121/118M - 98552

Shop the Hercules Strong Guard C-ST 225/75R15 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.

What 225/75R15 means

In the size 225/75R15, 225 is the section width in millimeters (8.86 in), 75 is the aspect ratio — the sidewall stands 75% as tall as the tire is wide, or 168.8 mm (6.64 in) — R denotes radial construction, and 15 is the wheel diameter in inches. That works out to an overall diameter of about 28.29 inches, turning roughly 713 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 28.11 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 121 — a maximum load of 3,197 lbs per tire, or 118 (2,910 lbs) per tire when mounted as duals. The speed symbol M corresponds to a maximum sustained speed of 81 mph.

Specifications

Frequently asked questions

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 121/118M mean on the Hercules Strong Guard C-ST?

121/118M breaks down as load index 121 — rated for 3,197 lbs per tire (118, or 2,910 lbs, in dual fitment) — with an M speed rating, good for a maximum sustained 81 mph.

Will 225/75R15 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 225/75R15, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right.

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