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.
Track real-world rubbing reports, required fender modifications, and aggressive fitment specs submitted by the community. We use this verifiable data table to ensure accurate, high-authority fitment reporting.
| Vehicle | Wheel Spec | Tire Spec | Rubbing Status | Modifications |
|---|---|---|---|---|
| 2024 Subaru WRX | 18x9.5 +38 | 255/35R18 | Rubs on Dips | Rear fenders rolled |
| 2024 Honda Civic Si | 18x8.5 +35 | 235/40R18 | Clear | None |
| 2024 Ford Mustang GT | 20x10.5 +45 (Rear) | 305/30R20 | Slight Rub | Requires -2° Camber |
| 2024 Toyota GR Corolla | 18x9.5 +38 | 265/35R18 | Clear | Lowering springs installed |
| 2024 VW Golf GTI | 19x8.5 +45 | 235/35R19 | Inner Rub | Fender screw mod required |
Ensure precision offset adjustment, perfect bolt torques, and resolve suspension/steering telemetry codes with verified gear.
After installing new wheels or spacers, always torque your lug nuts to manufacturer specification. This high-precision click wrench features a dual-range scale and durable all-steel build.
Diagnose suspension codes, steering angle sensor mismatches, or traction control alerts immediately after lowering or changing offset profiles. Live telemetry logged directly to your phone.
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.