Interference Risk Checker
Check for potential tire interference with wheel wells, suspension components, and body panels when changing tire sizes
Original Tire Specifications
New Tire Specifications
Vehicle Information
How to use the interference checker
Start with accurate baseline measurements. Jack the vehicle safely, cycle steering lock-to-lock, and record the tightest clearance between the tire shoulder and nearby components. Enter that data next to your stock tire size in the form above. Then plug in the future tire or wheel setup you are considering to see whether the extra width, offset, or diameter will hit a component.
The checker references the same geometry engine that powers the tire size calculator and tire comparison tool so every millimeter stays consistent. When the delta column shows more than ±3%, plan on trimming or choosing a narrower wheel to restore clearance.
Pair this page with the wheel offset visualizer to double-check new hub-centric spacers or aftermarket wheels. The combination gives you both the linear interference math and a visual change log for the suspension and fender side of the equation.
Key tolerances
- ≤ 3% diameter change: typically safe with minor liner trimming; monitor ABS and stability control.
- 3–5% diameter change: borderline. Expect gearing change, speedometer drift, and extra clearance work.
- > 5% change or > 10 mm offset swing: plan body mount chops, crash bar relocation, or a different setup.
- Ride height adjustments: If you lower or lift the vehicle, re-run the checker with the new static height and travel numbers.
Watchpoint
Inner fender liners and pinch welds
Wide tires and aggressive offsets pull the tread closer to the cabin. Measure liner clearance at full lock and enter that value so the tool can warn you when tread plus bulge crosses the pinch weld.
Watchpoint
Upper control arms & struts
Lifted pickups with factory positive offset wheels run into the coil bucket first. Record the narrowest distance between the tire shoulder and strut housing before testing new spacers.
Watchpoint
Bump travel and compression
Air out suspensions bottom the tire against fenders before steering interference shows up. Add the bump travel data from your coilover manual so the calculator can simulate full compression.
Watchpoint
Body mounts & crash bars
SUVs often need body mount chops when jumping beyond +1" of diameter. Use the warnings column to plan trimming vs. a different tire profile.
Load & PSI planning
Use the Load Safety Validator to verify the new tire’s load index can safely carry your axle weight.
Check load index →Speedometer alignment
Feed the selected size into the Speedometer Correction calculator to see MPH drift and adjust gearing.
Calibrate speed →Pressure & wear
Finish by dialing PSI with the tire pressure calculator and log wear trends inside the tire wear tool.
Set PSI targets →Interference checker FAQ
What measurements do I need before using the interference checker?+
Record clearance from the tire shoulder to struts, fender liners, crash bars, and body mounts at ride height and at full steering lock. These dimension inputs help the tool simulate the extra section width or diameter you plan to add.
How accurate are the rubbing projections?+
The model uses the standard tire geometry from the Tire Size Calculator plus your measured clearances. It highlights combinations that exceed your available room by more than 3 mm so you can plan trimming or a milder setup.
Does suspension travel get factored into the warning?+
Yes. Enter bump travel and droop so the checker can simulate the tire path through the full stroke. If you do not know the value, start with the manufacturer spec from your shocks or coilovers.
Can I use spacer thickness or wheel offset changes?+
Include your future wheel offset or spacer stack so the math accounts for the track width shift. The tool recalculates inner and outer clearance using your new offset and compares it with OEM geometry.
How should I handle mixed fitment front to rear?+
Run the checker for each axle with the right baseline measurements. Many off-road or staggered sports setups have different clearances at the front and rear, so individual analysis prevents surprises.
Disclaimer
The calculations and recommendations on this site are for informational purposes only. Always consult your vehicle manufacturer, tire professional, and local regulations before making any changes to tire or wheel size.