Toyo TOY Observe GSI-6 LS 255/45R20XL

Looking for a 255/45R20 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 255/45R20 means

In the size 255/45R20, 255 is the section width in millimeters (10.04 in), 45 is the aspect ratio — the sidewall stands 45% as tall as the tire is wide, or 114.8 mm (4.52 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 29.04 inches, turning roughly 695 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 20 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 105 — a maximum load of 2,039 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 255/45R20 is a performance winter tire.

Will 255/45R20 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 255/45R20, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 255/45R20 tire in stock to compare options.

What does 105H mean on the Toyo Observe GSI-6 LS?

105H breaks down as load index 105 — rated for 2,039 lbs per tire — with an H speed rating, good for a maximum sustained 130 mph.

Keep shopping

Shop all 255/45R20 tires, see every Toyo Observe GSI-6 LS size, explore winter snow tires, or view all tires at ThreePiece.us.