PCD stands for “pitch circle diameter”. Your vehicles’ PCD will tell you how many studs or bolts your vehicle has and measures, in millimetres the distance from the centre of one wheel hole to the next.
The most common 4x4 fitment has 6 studs and a PCD of 139.7mm, this is written as 6x139.7.
Every vehicle has a unique offset. The offset determines where the bolt up face is situated on that vehicles wheel and where it will sit in relation to your guard or vehicle bodyline. The offset is measured in mm from the centreline of the wheel to the bolt up face.
If a wheel has a positive offset it generally has less dish and a flatter face as the bolt up face is closer to the face of the wheel.
If a wheel has a negative offset, it generally has a deep dish and the bolt up face sits closer to the rear of the wheel. If you’re looking to push your aftermarket wheels out from underneath your vehicle, you need to get a lower offset than what comes standard on your vehicle.
Always consult a professional when changing the offset of your wheels. There’s many factors to consider including the width of the standard and new wheels, laws, tyres and more.
A vehicles’ hub size will also determine whether an aftermarket wheel will fit on your vehicle. Hub sizes for 4x4’s vary from 65.1 to 110.2 and sometimes even bigger! Obviously manufacturers can’t make thousands of different sized centre bores for their wheels so most commonly, they manufacture their rims with a 73.1 or 110.5 centre bore and hub locators are supplied to pick up the slack.
If you’re getting rims out of the USA, be sure to check your wheels’ centre bore as it’s common in USA to only go to 106.1. This just won’t do for some vehicles like Patrol’s and Landcruisers.
Just because the wheel will sit out 24.05mm doesn't mean it will sit out past your guard. Measure the distance from where your standard wheel sits to the edge of your guard
A wider tyre will affect where the tyre ends up in relation to your guard.
The tread of the tyre - obviously a mud terrain is going to sit out further than a road tyre given the tread
When fitting aftermarket wheels and tyres you need to be concious of your suspension set up. If you will be putting a wider and higher offset rim on your vehicle with a wider tyre, you need to consider if it will fit inside your vehicle without fouling
Lift kits can give the appearance of wheel sitting in further. You can afford to bring the wheel out a little more if a lift kit is installed
Some 4x4's have larger than normal brakes, take into consideration the D40 Navara, 2010+ JK Wrangler, the NW Pajero and the new Y62 Patrol. These vehicle have large brakes and can struggle when fitting aftermarket alloys, especially if you want to decrease in diametre. It is recommended to always do a fitment cleck or measure up prior to purchasing unless you are dealing with experienced aftermarket alloy wheel retailers... like us :P
Every aftermarket alloy is unique in its’ design. Just because you think 15” alloys will work on your 2001 Patrol doesn’t meant the 15x10 wheel you want, will fit! You need to consider many variables like drop centre (for caliper clearance) and x-factor. A general rule to follow is if your vehicle came out with a 16” wheel, then it’s most likely most 16” wheels and bigger will work