Tire Size Comparisons

Why comparing tire sizes matters

Most tire-size mistakes happen because two sizes look close at a glance. A change in width, aspect ratio, or wheel diameter can alter the overall height of the tire, and that height is what changes speedometer readings, gearing feel, and revolutions per mile. Comparison pages make the difference visible before you spend money.

Use these pages when you are considering an alternate size, shopping a different wheel diameter, or checking whether a winter setup will stay close to your factory size. The closer the overall diameter stays to the original tire, the less likely you are to notice speedometer and drivability changes. Wider or taller tires may still work, but they deserve a closer clearance check.

1. Open the comparison closest to the two sizes you are considering.
2. Check the diameter percentage difference before focusing on appearance.
3. Confirm load rating, wheel width, offset, and vehicle clearance separately.

How to pick the right comparison page

Start with the size already on the vehicle, then choose the size you are considering as the second tire. If you do not see the exact pair listed, open the main calculator and enter the two sizes manually. The prebuilt pages are here for common lookups, but the calculator can compare any valid metric tire size.

When scanning the results, look at diameter difference first, then sidewall and width. Diameter tells you about speedometer behavior. Sidewall tells you about ride feel and impact absorption. Width tells you where clearance and wheel compatibility may become more important.

Comparison pages are a starting filter

A comparison page can tell you whether two sizes are close on paper. It cannot see the fender liner, suspension arm, brake clearance, or wheel offset on your specific vehicle. Treat the numbers as the first filter in the buying process.

If the numbers look good, the next step is to verify fitment details. Check the vehicle placard, wheel specifications, tire manufacturer specs, and any notes from a trusted tire professional. That keeps the decision practical instead of relying only on a generic answer.

Use the percent difference as your first decision point

The comparison list is designed to move you from curiosity to a practical answer quickly. A small percentage difference in overall diameter usually means the two sizes are close in rolling height. A larger percentage difference does not automatically mean the size is wrong, but it does mean you should expect a more noticeable change.

For daily drivers, that change may show up as speedometer error, slightly different acceleration feel, or a different ride height. For trucks and off-road builds, the same change may be intentional. The calculator does not judge the setup; it shows the tradeoff clearly so you can decide with better information.