When it comes to chassis setup and handling performance on asphalt ovals, racers obsess over stagger, camber, crossweight, and springs. But there’s one often-overlooked adjustment that can significantly impact how your car handles every corner of the track: wheel backspacing.
Whether you're running a Legend Car, Street Stock, or Late Model, selecting the correct backspacing and even running different backspacing left to right can unlock grip, improve balance, and help your tires last longer.
What Is Wheel Backspacing?
Backspacing is the distance from the wheel’s mounting surface (where it bolts to the hub) to the back edge of the wheel. It determines how far the wheel sits inward or outward in the wheel well.
More backspacing (e.g. 5") tucks the wheel closer to the chassis.
Less backspacing (e.g. 3") pushes the wheel outward toward the fender.
The result? A subtle but important change in track width, weight distribution, scrub radius, and tire clearance.
Why Backspacing Matters on the Oval
On a short track oval track: corner entry, mid-turn rotation, and exit bite all hinge on how the tires interact with the racing surface. Wheel backspacing plays a surprising role in this dynamic.
Changing Track Width Side-to-Side
Running a wider track width on one side (typically the right side) by using less backspacing can improve cornering grip and lateral stability. On the left side, pulling the wheels in slightly can help the car rotate better and reduce tightness in the center of the corner.
Common Setup Example:
Left Side Wheels: 5.00" backspacing
Right Side Wheels: 3.00" backspacing
This slight asymmetry can fine-tune your handling balance, especially at flat tracks or when trying to sharpen your mid-turn performance.
Backspacing vs. Offset: What’s the Difference?
While related, backspacing is not the same as offset.
Backspacing measures from the mounting surface to the back edge.
Offset measures from the centerline of the wheel to the mounting surface.
Both affect fitment, but backspacing is more commonly referenced in circle track racing, where clearance and track width are vital considerations.
Backspacing Affects More Than Just Fit
Here’s how wheel backspacing adjustments influence performance:
| Effect | More Backspacing (Tucked In) | Less Backspacing (Pushed Out) |
|---|---|---|
| Track Width | Narrower | Wider |
| Tire Clearance | Better inside clearance | More outer clearance needed |
| Scrub Radius | Reduced | Increased |
| Car Feel | Looser (better rotation) | Tighter (more planted) |
| Side Bite | Slightly reduced | Increased |
Final Thoughts
Backspacing might seem like a small detail, but in the world of asphalt circle track racing, small details win races. Whether you're dialing in a Legend Car or a Late Model, understanding how to use backspacing strategically, especially by varying it between the left and right sides, can be the difference between running mid-pack and running up front.
Need Help Picking the Right Wheels?
At Impel Motorsports, we carry a full range of Bassett Racing Wheels and can help you choose the best backspacing for your car, track, and driving style.
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