Free fitment calculator for 200+ vehicles. Check clearance before you buy.
Try the Calculator*Positive outboard moves toward fender. Positive inboard moves toward strut. Positive diameter is a taller tire.
Offset is the distance from the hub mounting surface to the center line of the wheel. Positive offset brings the wheel closer to the suspension, while negative offset pushes it outward.
Typically, a 5-10mm change is safe for most stock vehicles. Beyond 15mm, you risk hitting the inner suspension components or outer fender lip.
It depends on the vehicle and offset. In general, going 10-20mm wider than stock is safe, but pairing wider tires with aggressive offsets often requires fender rolling.
Spacers are used to push wheels outward, either for aesthetic flush fitment or to clear large brake calipers and suspension parts. They reduce positive offset.
Use a fitment calculator to compare your stock setup to the new specs, then visually measure the resulting clearances on your actual vehicle.
Yes, rolling the inner fender lip flat provides 5-10mm of extra clearance for the tire's outer shoulder under suspension compression.
Yes. Stretching a narrower tire onto a wider wheel pulls the sidewall inward, which can create extra clearance between the tire and the fender lip.
The calculator uses exact mathematical formulas to determine changes in positioning. However, real-world fitment also depends on tire brand design, suspension geometry, and vehicle age.