Wheel Fitment Calculator

Calculate if new wheels will fit your car. Check offset changes, poke, and tuck before you buy.

Quick Presets

Enter your current and new wheel specs to see fitment changes

Wheel Fitment Explained

Offset is the distance from the wheel's mounting surface to its centerline, measured in mm.

Poke means the wheel sticks out toward the fender. Tuck means it moves inward toward the suspension.

This calculator shows exactly how much the wheel position changes when you swap specs.

How to Use

Enter your current wheel specs (width, offset, diameter)
Enter the new wheel specs you're considering
Review the poke/tuck changes
Check if clearances work for your setup

Offset Guide

Lower offset (e.g., +20)

More aggressive look, wheel pokes out. May rub fender.

Higher offset (e.g., +45)

Wheel sits further inward. May rub suspension.

Wider wheel + same offset

Expands both directions equally. Extra width split 50/50.

FAQs

What is wheel offset?

Offset is the distance in mm from the wheel's mounting surface to its centerline. Positive offset means the mounting surface is toward the outside (street side), negative means toward the inside (suspension side).

Will wider wheels fit my car?

Wider wheels expand equally in both directions from the centerline. You'll need to check both fender clearance (outside) and suspension clearance (inside). Lower offset can help push the wheel outward.

How much poke is too much?

More than 10-15mm of poke typically requires fender rolling or pulling. Excessive poke can cause tire rub during turns or over bumps, and may be illegal in some areas.

Does wheel diameter affect fitment?

Wheel diameter doesn't affect side-to-side fitment, but you'll need to adjust tire size to maintain the same overall diameter. Larger wheels may have brake caliper clearance issues.

Limitations

Doesn't account for tire sidewall differences
Can't predict fender/suspension clearance
Actual fitment varies by vehicle and suspension setup
Doesn't consider brake caliper clearance

Wheel Fitment Calculator

Current Wheels

New Wheels

Quick Presets

Fitment Results

What This Means