Wheel Offset Defined in Simple Terms
Wheel offset is the distance between the wheel’s mounting pad (where it bolts to the hub) and the centerline of the rim. It controls how far the wheel sits inward or outward in the fender, affecting clearance, handling, and overall fitment. Understanding offset is essential when upgrading rims, choosing wider wheels, or modifying your vehicle’s stance.
Table of Contents
Wheel Offset Explained
The centerline of the wheel is the exact middle of its width, measured between the inner tire bead seats. Wheel offset is how far the hub mounting surface sits from the centerline. This distance determines how the wheel positions itself relative to your suspension, brakes, and fenders.
Offset is always measured in millimeters and is typically stamped on the back of the wheel as ET (from the German word Einpresstiefe, meaning “insertion depth”).
- ET47 → +47 mm offset (positive)
- ET35 → +35 mm offset
- ET0 → zero offset
- ET-12 → -12 mm offset (negative)
Offset determines:
- Inner clearance to suspension components
- Outer clearance to fenders and liners
- Steering feel and stability
- How “flush” or “aggressive” the wheel looks
Most modern OEM wheels use a high positive offset for safety, stability, and brake package compatibility. Custom aftermarket wheels for trucks and off-road builds often use a lower or negative offset for a wider stance.
Positive, Zero & Negative Offset
Positive Offset
The hub mounting surface is toward the front (street side) of the wheel. This pulls the wheel inward toward the suspension.
- Most OEM wheels (cars, SUVs, trucks)
- Smaller visible lip
- Helps maintain factory geometry and clearance
Zero Offset
The hub mounting surface sits exactly on the centerline. This creates a balanced, neutral stance with equal inner and outer distribution.
- Older RWD vehicles
- Some off-road builds
- Neutral visual and functional balance
Negative Offset
The hub mounting surface is toward the inside of the wheel. This pushes the wheel outward, creating a wider stance and a deep-dish look.
- Common in off-road and deep-dish styles
- More visible lip / aggressive look
- May cause rubbing if too extreme
How to Measure Wheel Offset
Step 1 — Find the Wheel Width
Measure the width between tire bead seats, not edge-to-edge. A 9″ wheel has a centerline at 4.5″.
Step 2 — Measure From Hub Pad to Inner Bead
Place a straight edge on the inner bead seat and measure the distance to the hub mounting surface.
Step 3 — Convert to Millimeters
- Offset (inches) = Measured distance − Centerline
- Offset (mm) = Offset (in) × 25.4
But the truth? You rarely need to measure. 99% of modern wheels have the offset stamped on the back.
Typical Offset Ranges by Vehicle Type
These are common OEM ranges. Always verify your specific Year/Make/Model before changing wheels.
| Vehicle Type | Typical Offset Range | Notes |
|---|---|---|
| FWD cars | +35 mm to +50 mm | High offset keeps geometry stable. |
| RWD cars | +15 mm to +40 mm | More variation for performance setups. |
| AWD cars / crossovers | +30 mm to +50 mm | Tuned for drivetrain balance. |
| Trucks / SUVs | +18 mm to +45 mm | Lower offsets used for wide-stance builds. |
| Aftermarket deep-dish | 0 mm to −44 mm | Lower offsets are used for wide-stance builds. |
How Much Offset Can You Change Safely?
You can change offset, but staying close to OEM specs avoids rubbing and handling issues.
- 0–5 mm difference → Very safe
- 6–10 mm difference → Usually fine, verify clearance
- 10+ mm difference → Risk of rubbing & geometry changes
Problems Caused by Incorrect Offset
- Rubbing on fender liners or body
- Contact with struts, control arms, or brakes
- Stress on wheel bearings and suspension joints
- Poor handling, instability, or tramlining
- Possible tire damage under compression
How to Find Your Wheel Offset Without Measuring
Most wheels have a clear offset stamp on the back:
- Remove the wheel
- Inspect the back of the spokes or hub area
- Look for a marking such as: ET47, ET35, ET0, ET-12
- This number is your exact offset in millimeters
For standardized rim and tire measurement practices, see the Tire & Rim Association’s published guidelines.
Use Our Free Wheel Offset & Tire Size Calculator
No math. No guessing. Use our free tool to confirm the OEM offset for your vehicle or compare aftermarket wheel options.
Truck owner? Check our latest Chevy Silverado Fitment Guide (2026) for real-world tire and offset setups.
Wheel Offset FAQs
Click on each question to see the answer:
What is wheel offset?
Wheel offset is the distance in millimeters between the wheel’s hub mounting surface and the true centerline of the wheel.
What is positive wheel offset?
Positive offset means the hub mounting surface sits towards the face of the wheel, pulling the wheel inward toward the suspension.
Is it safe to change your wheel offset?
Yes, as long as changes remain small (3–5 mm). Larger changes may cause rubbing, instability, or interference with brakes and suspension.
How do I find the offset on my wheels?
Most OEM and aftermarket wheels have the offset stamped behind the spokes. Look for markings such as ET40, ET+45 or ET-12.
