18×8 Tire Size: What Fits This Wheel?

Your tire size and wheel are two things that must match for your vehicle to function properly. So the question here is, 18×8 tire size: what fits this wheel?

The most recommended tire size for 18×8 rim is 225/40 R18. It will keep the steering precise and provide the best response. However, if you want a little wider tire, your best bet is 235/40 R18. It fills the guards better while providing better braking, thanks to its larger patch under braking load.

In this article, we bring you all relevant information regarding the tire size for the 18×8 wheel. If this catches your attention, read on to know more.

What Does 18×8 Rim Mean?

An 18×8 rim refers to the size of the wheel. The “18” represents the wheel’s diameter in inches, while “8” represents its width (Diameter × Width). In essence, an 18×8 rim implies that the wheel has a diameter of 18 inches, and has a width in 8 inches. The majority of rims come with three basic sizes behind the hub. These sizes tell you whether or not the rim will fit the tire. You can use this information as a guide when getting new tires.

18x8 rim size explanation
18×8 rim implies that the wheel has a diameter of 18 inches, and has a width in 8 inches

What Tire Sizes Fit 18×8 Wheel?

Choosing the right tire size for your wheel goes a long way in the comfort of your vehicle. According to many cars’ users, the tire sizes below have been said to fit the 18×8 rim. These are among the most common sizes used for 18×8 rim.

  • 215/35 R18
  • 225/35 R18
  • 205/40 R18
  • 215/40 R18
  • 225/40 R18
  • 235/40 R18
  • 215/45 R18
  • 245/40 R18
  • 225/45 R18
  • 235/45 R18
  • 235/50 R18
  • 235/55 R18

We understand that tire sizing can be difficult to understand, so here’s a guide to decoding the sizing pattern on your tire:

  • The first number in the sequence is the tire’s total width measured in millimeters
  • The second number represents the sidewall height as a percentage of the tire width
  • The last number represents the diameter of the recommended wheel for a tire (measured in inches)

For example, if you buy a 225/20 R18 tire, the measurements would be:

Tire Size Explanation
Tire Size Explanation

What Is The Best Tire Size For 18×8 Wheel?

The 225/40 R18 and 235/40 R18 are perfect for the 18×8 wheel. These tires have a perfect sidewall shape allowing them to fit well in the 18×8 wheel.

We understand that the word “best” might translate differently to different people as it is indeed generalized.

Between these two tire sizes, the most recommended one for 18×8 rim is 225/40 R18. It will keep the steering precise and provide the best response.

225/40 R18 Kumho Solus tire
225/40 R18 Tires

However, if you want a little wider tire, your best bet is 235/40 R18. It fills the guards better while providing better braking, thanks to its larger patch under braking load.

235/40 Continental ContiProContact tire
235/40 R18 Tires

What Is The Smallest Tire Size On 18×8?

The 215/35 R18 tire is the smallest you can go and still be in the safe zone. In this context, the safe zone refers to the point you are not put at risk due to the size of your tires.

215/35 R18 Vercelli Strada tire
215/35 R18 Tires

Below we have provided you with a few pros and cons of using smaller tires instead of suitable ones.

Pros

  • Improved handling
  • More aerodynamic
  • More flexible sidewalls

 Cons

  • Inaccurate speedometer and odometer readings
  • Transmission shifting problems
  • Malfunctioning of anti-lock brakes

What Is The Biggest Tire Size On 18×8?

Keeping in mind that bigger isn’t always better, the biggest tire size you can fit on 18×8 and remain safe is the 245/40 R18 tire.

245/40 R18 Kumho Ecsta tire
245/40 R18 Tires

While this is a matter of choice, we recommend that you use tire sizes that match your vehicle’s wheel perfectly for optimum performance. However, larger tire sizes do have their perks. Below we have listed a few advantages and disadvantages of fitting larger tire sizes compared to suitable ones.

Pros

  • Improved traction and grip
  • Improved cornering
  • Better braking
  • Often look better
  • Better ground clearance

Cons

  • Increased fuel consumption
  • Hard steering
  • Low acceleration
  • Quick tread wear
  • Reduced handling

Conclusion

As we’ve always said, your safety and the safety of others should be your number one priority when driving. This means that if fitting much smaller or larger tires on your vehicle compromises your driving efficiency, then stick to suitable ones.

As mentioned earlier, the best-fitted tire size for your 18×8 inch wheel is 225/40 R18. You can pick 235/40 R18 if you want a little wider tire size. Both of these tire sizes are good fits for your 18×8 rim.

Read more: 15×8 Tire Size: What Fits This Rim?

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