Cooper Discoverer True North 225/45R18XL 95H - 166191004

Looking for a 225/45R18 winter tire? The Cooper Discoverer True North is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.

What 225/45R18 means

In the size 225/45R18, 225 is the section width in millimeters (8.86 in), 45 is the aspect ratio — the sidewall stands 45% as tall as the tire is wide, or 101.2 mm (3.99 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 25.97 inches, turning roughly 777 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 26.77 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 95 — a maximum load of 1,521 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 Cooper Discoverer True North?

The Cooper Discoverer True North in 225/45R18 is a winter tire.

Will 225/45R18 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 225/45R18, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 225/45R18 tire in stock to compare options.

What does 95H mean on the Cooper Discoverer True North?

95H breaks down as load index 95 — rated for 1,521 lbs per tire — with an H speed rating, good for a maximum sustained 130 mph.

Keep shopping

Shop all 225/45R18 tires, browse Cooper tires, see every Cooper Discoverer True North size, explore winter snow tires, or view all tires at ThreePiece.us.