Tire 1 (Original)
Tire 2 (New)
Comparison Results
| Specification | Tire 1 (Original) | Tire 2 (New) | Difference |
|---|---|---|---|
| Diameter | 24.88 inches | 24.77 inches | -0.11" (-0.4%) |
| Width | 8.07 inches | 8.46 inches | +0.39" |
| Sidewall | 4.44 inches | 3.39 inches | -1.05" |
| Circumference | 78.16 inches | 77.82 inches | -0.33" |
| Revs per Mile | 811 | 814 | +3 |
| Suspension Clearance | - | - | +0.20" closer to suspension |
| Fender Poke | - | - | +0.20" pokes out more |
| Scrub Radius | - | - | No Change |
| Visual Stance | Factory | Flush | Flush |
| Tire Stretch | Aggressive Stretch | Mild Stretch | Mild Stretch |
| RPM @ 100 km/h (est.) | 2500 RPM | 2511 RPM | +0% (Higher Revs) |
Speedometer Error
When your speedometer reads 100 km/h, you are actually traveling at 99.57 km/h.
👨🔧 Expert Simulation Review
Let's break down what happens when you switch from your original 205/55R16 tires to the new 215/40R18 setup. The new tire has a total diameter of 24.8 inches. This means it is 0.4% shorter than your factory tire. Knowing this size difference is the first step to making sure your new tires won't rub against the car's body when you go over bumps.
Here is the great news: car experts always recommend keeping the size difference under 3%, and your new choice fits right in! Because you are staying within this safe zone, your car's computer, brakes (ABS), and suspension will keep working perfectly, just like they did from the factory.
Because the new tires are a different size, they will spin at a slightly different speed. When your dashboard says you are driving 60 mph, you will actually be going 59.7 mph. Also, when you are cruising on the highway, your engine will run about 0% higher (more RPM) than it used to. It's a good idea to keep this in mind so you don't accidentally get a speeding ticket!
Now, let's talk about how the car will look. Your new setup pushes the wheels out by 5.0 mm, bringing them right in line with the edge of the fenders. Car enthusiasts call this a "Flush" fitment, and it is known for giving cars a very sleek, sporty, and custom appearance.
Finally, looking at how the tire fits on the wheel: your tire will have a "Mild Stretch." This is a very popular choice for sports cars because it makes the steering feel sharper and gives a little extra room so the tire doesn't rub against the fender during tight turns.
Alternate Tire Sizes
Looking to change your wheel size? Here are tire sizes that will keep your speedometer accurate (within 3% of original diameter).