What New Off-Road Builders Need to Know About 4WP Wheel Fitment

If you’re in the beginning stages of building your off-roader, wheel fitment might seem like a small part of the overall build—but it’s also one of the most important things to do right. From tire clearance to the chassis’ ability to articulate and even steering geometry and off-road performance, wheel backspacing is a big deal. Rubbing, poor handling or even suspension damage can sometimes result from having the wrong wheels.

That’s why thousands of builders rely on 4 Wheel Parts (4WP) for expert advice and our complete selection of wheels tailored to trucks, Jeeps, and SUVs. Knowing the fundamentals of backspacing, offset and the relationship between wheel size and tires can help you save time, money and headaches as you upgrade your rig.

This guide will walk you through what new off-road builders need to know about 4x4 wheels and how to get the right fitment for your setup.

Backspacing Affects Clearance

Easily one of the most complex and confusing elements relating to wheel fitment is that of backspacing, and as many a truck owner has discovered in the past, if you don't get it right it can cause some seriously big clearance issues -- especially once larger tires and suspension mods enter the equation.

What is backspacing?

Backspacing is the distance from the mounting surface of the wheel to the inside edge of the wheel. It will have a direct influence on how much your wheels and tires are sunk in your fender wells and how close they come to suspension part.

• Excessive backspacing pulls the wheel in, and can result in the tire catching a control arm, sway bar, or inner fender liner.
• Not enough backspacing will pull it out from under the rig, this may give you more clearance but can cause excessive stress to your wheel bearings as well as fender clearance issues.
• For example, if you’re installing 33 inch off road tires, you’ll need wheels with backspacing and offset that give those larger tires room to move through the suspension’s full travel range—especially under articulation.

4WP takes the hassle away with our selection of 4x4 wheels that meet the specs for a variety of popular tire sizes and your particular vehicle make/model. These wheels are real world tested off-road performance and trail clearance.

Backspacing also affects your steering radius, scrub radius and suspension geometry—all of which are critical for predictable off-road handling.

Proper Fitment Matters for Performance

Fitment isn’t just steering clear of rub or making your tires “look right. It’s something that directly effects your rig in terms of performance, safety and longevity.

So, what difference does it make how well your suspension is adjusted to fit your wheel setup:

1. Steering and Handling

Wrong offset will lead to incorrect steering geometry of your Jeep or truck. Which can cause your car to feel nervous or unstable, particularly at speed. Correctly fitted it will provide strong steering input and eliminate bump steer or wander in rough conditions.

2. Suspension Travel and Articulation

Wrong size wheels or the wrong offset can prevent your suspension from flexing. If you’re crawling across jagged rocks or around deep ruts you want all the articulation possible. Right wheels let your suspension do its job without tires hitting the body or frame.

3. Tire Life and Wear Patterns

Misaligned wheels or improper fitment can lead to uneven tire wear. If you're running aggressive off road tires,   this can shorten their lifespan and reduce your return on investment.

4WP provides extensive fitment information for all of the products they carry to keep new builders from making these expensive mistakes. Sure, with their staff of experts and above-average supply of 4x4 wheels, they make it easier to choose the right wheel for your current suspension set-up, desired tire size and off-road aspirations.

Final Thoughts: You Can’t Judge a Wheel Just by Its Looks

As a salt track builder you may be thinking about lift kits, lockers or tire choice – but don’t forget about wheel fitment – it matters! Choosing the wrong wheels can hobble your build and affect how it rides, how comfortable you are, and how much you trust its dependability.

First, familiarize yourself with the way backspacing and offset work in relation to your clearances and suspension geometry. Select wheels that reflect your vehicle’s specific needs and style: whether it's a set of 33 inch off road tires, any terrain tires or even the burliest mud tires.