Toyo M655 LT LT245/75R17 121/142Q - 556720

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What 245/75R17 means

In the size 245/75R17, 245 is the section width in millimeters (9.65 in), 75 is the aspect ratio — the sidewall stands 75% as tall as the tire is wide, or 183.8 mm (7.23 in) — R denotes radial construction, and 17 is the wheel diameter in inches. That works out to an overall diameter of about 31.47 inches, turning roughly 641 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 31.9 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 142 (5,842 lbs) per tire when mounted as duals. The speed symbol Q corresponds to a maximum sustained speed of 99 mph.

Load Range E corresponds to a 10-ply rating.

Specifications

Frequently asked questions

Will 245/75R17 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 245/75R17, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 245/75R17 tire in stock to compare options.

What does 121/142Q mean on the Toyo M655 LT?

121/142Q breaks down as load index 121 — rated for 3,197 lbs per tire (142, or 5,842 lbs, in dual fitment) — with a Q speed rating, good for a maximum sustained 99 mph.

What kind of tire is the Toyo M655 LT?

The Toyo M655 LT in 245/75R17 is a all season tire.

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