Biggest Tyres For Prado 150 - What's The Legal Max Size?

Ready to bang some bigger tyres on your Toyota Prado 150? Wondering what the biggest legal size that you can get away with is?

Before you get too excited and go and purchase a set of 4 tyres from the splurge account without telling your wife, I'd recommend using our tool below to work out whether the tyres you've got your eye on can actually be legally fitted to your model Landcruiser.

VSB 14 - Tyre Size Guidelines

In just about all Australian states, the VSB 14 regulations dictate the legality of vehicle modifications.

As we know from these guidelines, standard passenger vehicle tyre diameter can only be increased by 15mm from the diameter designated by the manufacturer for that model.

For 4WD passenger and goods vehicles that are designed for off-road use, that allowance increases to 50mm more than the diameter designated for that model (regardless of lift).

To calculate the maximum legal tyre size for your Prado, select whether it is subject to 15mm or 50mm diameter restrictions, and enter the manufacturer tyre size on the placard found on the driver's side door.

Alternatively, enter the details of your model and we will work out the maximum legal size for you.

What Size Tyres Can I Fit On My Prado 150?

For your reference, here are some common Landcruiser Prado models along with their manufacturer recommended size and legal maximum size. Note that this table assumes a maximum diameter increase of 50mm (as is standard for 4WDs).

For just about every model of Prado 150, the manufacturer recommended tyre size is 265/65R17. This means that the maximum legal tyre size for the Prado 150 is 275/70R17.

How Do I Calculate The Maximum Legal Tyre Size For A Prado 150?

If you want to do the calculations yourself, here's how.

First, you'll need to calculate the diameter of the manufacturer recommended tyres for your vehicle. The diameter is the sum of the wheel/rim size plus 2 times the sidewall size (all in millimetres).

If your stock tyre size is 265/65R17, your sidewall size will be:

Sidewall size = 265mm x 0.65 = 172.25mm

Your wheel/rim size is simply the conversion of the 17 inches into millimetres:

Rim size = 17 inches x 25.4 mm/inch = 431.8mm

Therefore, your stock tyre diameter is:

Stock tyre diameter = (2 x 172.25mm) + 431.8mm = 776.3mm

If you have a 4WD Prado, your maximum legal tyre diameter as per VSB 14 will be the stock diameter plus 50mm.

Max tyre diameter = 776.3mm + 50mm = 826.3mm

Now, you just need to find a tyre size with a diameter less than 826.3mm (but as close as possible).