Toyo TOY Observe GSI-6 LS 235/55R18

Looking for a 235/55R18 performance winter tire? The Toyo Observe GSI-6 LS is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.

What 235/55R18 means

In the size 235/55R18, 235 is the section width in millimeters (9.25 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 129.2 mm (5.09 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 28.18 inches, turning roughly 716 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 18 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 100 — a maximum load of 1,764 lbs per tire. The speed symbol H corresponds to a maximum sustained speed of 130 mph.

Specifications

Frequently asked questions

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

The Toyo Observe GSI-6 LS in 235/55R18 is a performance winter tire.

Will 235/55R18 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 235/55R18, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 235/55R18 tire in stock to compare options.

What does 100H mean on the Toyo Observe GSI-6 LS?

100H breaks down as load index 100 — rated for 1,764 lbs per tire — with an H speed rating, good for a maximum sustained 130 mph.

Keep shopping

Shop all 235/55R18 tires, see every Toyo Observe GSI-6 LS size, explore winter snow tires, or view all tires at ThreePiece.us.