How Do I Safely Upsize The Wheels On My Car?

Low profile tires are all the rage are thin. To make your car look different, you can change to a bigger wheel. This is easy. It will make your car better on turns because it doesn't bend as much when turning corners. You can also get more tires that work with bigger wheels, like performance models at

There are some tradeoffs when it comes to tires and wheels. Lighter tires mean the car will go faster and use less fuel, but they also make the steering harder to turn.

Heavier wheels will make the car slower and less fuel-efficient, but they'll also give you a more comfortable ride. Additionally, shorter sidewalls on the tires provide less cushioning, making bumps in the road feel harsher.

How Big Can I Go?

If there are new wheels and tires, they might touch the fender when you turn or if the car bottoms out. The speedometer counts how many times the wheel turns, so it might be inaccurate if there are new bigger wheels. If your car has new bigger wheels, it is important to keep them at the same size that was on your old tires.

As a rule of thumb, it is safe to put a tire that is 20 millimeters wider than the original on the same rim. The width of the tire will vary depending on how wide the rim is: for every half inch increase in width of the rim, the tire will expand by 12,5 millimeters.

When you switch to a different rim, it can be more complicated because tire sizes are measured in both metric and percentage terms. Wheel sizes, on the other hand, are measured in Imperial measurements.

For example, the car currently has 225/45R15 tires. Here’s what that means:

- 225 – Tire width in millimeters

- 45 – Sidewall height as a percentage of tire width

- 5 – Rim diameter in inches

To convert the wheel size into millimeters, multiply by 25.4:

- 15 inches x 25.4 = 381 millimeters

Next, calculate the sidewall height by multiplying the tire width by the height percentage:

- 225 millimeters x 0.45 = 101.25 millimeters

Add the two numbers together, to get the total height of the wheel and tire:

- 381 + 101.25 = 482.25 millimeters

In order to keep your speedometer accurate, you need to make sure that the new tire and wheel are about the same height as the old one. If you switch to a 16 inch rim, you'll need a tire that is about 75.85 millimeters high. That's only about 34% of the width of the old tire, so there are lots of options available.

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