Toyo Observe GSI-6 LS 255/70R17 112H - 174710

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What 255/70R17 means

In the size 255/70R17, 255 is the section width in millimeters (10.04 in), 70 is the aspect ratio — the sidewall stands 70% as tall as the tire is wide, or 178.5 mm (7.03 in) — R denotes radial construction, and 17 is the wheel diameter in inches. That works out to an overall diameter of about 31.06 inches, turning roughly 649 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 112 — a maximum load of 2,469 lbs per tire. The speed symbol H corresponds to a maximum sustained speed of 130 mph.

Specifications

Frequently asked questions

Will 255/70R17 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 255/70R17, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 255/70R17 tire in stock to compare options.

What does 112H mean on the Toyo Observe GSI-6 LS?

112H breaks down as load index 112 — rated for 2,469 lbs per tire — with an H speed rating, good for a maximum sustained 130 mph.

What kind of tire is the Toyo Observe GSI-6 LS?

The Toyo Observe GSI-6 LS in 255/70R17 is a winter tire.

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