How to Choose the Right Portawalls® Size for Your Tires

Choosing the correct Portawalls® size is the most important step before ordering. The right size gives your vehicle a clean whitewall look, better fitment, and a more secure installation.

Omega Portawalls® are designed for classic cars, custom automobiles, motorcycles, cruisers, bobbers, and vintage-inspired builds. To choose the correct fit, you need to check three simple things:

Rim diameter
Tire sidewall height
Preferred whitewall width

Step 1: Find Your Tire Size

Start by checking the numbers printed on your tire sidewall.

A common tire size looks like this:

205/70 R15

The most important part for choosing Portawalls® is the number after the letter R.

In this example:

R15 = 15 inch rim diameter

That means you should choose 15 inch Portawalls®.

Other examples:

R13 = 13 inch Portawalls®
R14 = 14 inch Portawalls®
R15 = 15 inch Portawalls®
R16 = 16 inch Portawalls®
R17 = 17 inch Portawalls®

Always match the Portawalls® size with your rim diameter.

Step 2: Check Your Sidewall Height

After finding your rim size, check the height of your tire sidewall.

The sidewall is the area between the rim and the outer edge of the tire tread.

Portawalls® need enough sidewall space to sit properly.

As a general guide:

40 mm or more: recommended fit
Below 40 mm: not recommended
Low-profile tires: not suitable
Run-flat tires: not suitable

A thicker tire sidewall usually provides a better fit and a more natural whitewall appearance.

If your tire has a very thin sidewall, Portawalls® may not sit correctly.

Step 3: Choose Your Whitewall Width

Once you know your rim size and sidewall height, choose the whitewall width based on your preferred style.

Omega Portawalls® are available in different visual widths depending on size and style.

Common style choices include:

Slim Whitewall
A clean and subtle look. Good for modern custom builds and motorcycles.

Medium Whitewall
A balanced classic look. Works well on many cars and motorcycles.

Wide Whitewall
A bold vintage look. Ideal for classic cars, lowriders, and strong retro styling.

The wider the whitewall, the more sidewall height your tire should have.

Car Fitment Tips

For classic cars and vintage-style automobiles, Medium and Wide Portawalls® usually create the strongest visual effect.

Classic cars often look best with:

Medium whitewall
Wide whitewall
Classic white style
Custom contrast styles
Signature color styles

If your car has enough tire sidewall height, a wider whitewall can create a more authentic vintage appearance.

Motorcycle Fitment Tips

Motorcycles can be more specific because many bikes use different front and rear tire sizes.

Before ordering motorcycle Portawalls®, check:

Front tire size
Rear tire size
Whether both wheels use the same rim diameter
Whether you need a Front & Rear size combination

For custom motorcycles, bobbers, cruisers, and choppers, Slim or Medium whitewall styles often work best.

If the front and rear tire sizes are different, choose a product designed for Front & Rear Size Combinations.

Common Mistakes to Avoid

Before ordering, avoid these common mistakes:

Choosing the tire width instead of the rim diameter
Ignoring the number after “R”
Ordering Portawalls® for low-profile tires
Choosing a whitewall width that is too wide for your sidewall
Assuming front and rear motorcycle tires are always the same size

The safest method is simple:

Check the tire sidewall first, then choose your Portawalls® size.

What If You Are Not Sure?

If you are unsure about your size, contact us before ordering.

You can send:

A photo of your tire sidewall
Your tire size
Your vehicle type
Front and rear tire sizes for motorcycles

Our team will help you choose the correct Omega Portawalls® setup.

Final Thoughts

Choosing the right Portawalls® size is simple when you follow the correct steps.

First, find the rim diameter on your tire sidewall.
Second, check that your tire has enough sidewall height.
Third, choose the whitewall width that matches your style.

With the right fit, Omega Portawalls® can transform your vehicle with a clean classic whitewall look — without replacing your tires.