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225/45R18 Tires

225/45R18 is a metric tire size where 225 is the tread width in millimeters, 45 is the sidewall height as a percent of that width, and 18 is the wheel diameter in inches. At this ratio the sidewall is roughly 4.0 inches tall before you mount it on a 18-inch wheel. Load index, speed rating, and LT load range still vary by model—compare the specific tires below for those details.

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Common questions

What does 225/45R18 mean on a tire?

225 is section width in millimeters, 45 is the aspect ratio (sidewall height as a percent of width), and R marks a radial construction with a 18-inch rim diameter. Those three numbers define the overall tire diameter and how it fits your wheel.

How do I see everything you carry in 225/45R18?

This page highlights in-stock models with live pricing checked within our catalog window. Open the full tire search for this size to filter by brand, tread type, load range, and price as inventory changes.

Can I filter 225/45R18 results by brand or terrain?

Yes. Open the full tire search for this size to narrow by brand, highway or all-terrain tread, load range, speed rating, and price. Nothing is charged online until a rep confirms your order.

Live pricing: we lock in the lowest price, including any drops, sales, or rebates, when we confirm your order.