Wheel Spacer Size Calculator

A wheel spacer is a disk fitted between your hub and wheel to push the wheel outward — used when switching to a wider wheel or a different offset to maintain the correct stance and clearance. Enter your current wheel width and offset, your new wheel width and offset, and your available fender clearance into the Wheel Spacer Size Calculator to find the required spacer thickness. Secondary outputs include offset change, inner and outer clearance change, and a fitment status to confirm whether the combination will fit safely.

inches
mm

Positive offset pushes wheel inward, negative pushes outward

inches
mm
mm

Measure space between tire and fender

Results

Required Spacer Thickness

--

Offset Change

--

Inner Clearance Change

--

Outer Clearance Change

--

Fitment Status

--

More Automotive Tools

Frequently Asked Questions

What is wheel offset and how does it affect fitment?

Wheel offset is the distance between the wheel's mounting surface and its centerline. Positive offset moves the wheel inward toward the vehicle, while negative offset moves it outward. This affects how the wheel sits relative to your fenders and suspension components.

How do I measure the available clearance for spacers?

Measure the gap between your current tire sidewall and the fender at the widest point. This measurement gives you the maximum spacer thickness you can use without causing tire-to-fender contact.

What's the difference between wheel offset and backspacing?

Offset is measured from the wheel centerline to the mounting surface, while backspacing is the distance from the mounting surface to the inner edge of the wheel rim. Both measurements help determine proper wheel fitment.

Can wheel spacers affect my vehicle's handling?

Yes, spacers change your vehicle's track width and can affect handling characteristics. They may also put additional stress on wheel bearings and suspension components, so proper installation and quality spacers are essential.

What happens if I use spacers that are too thick?

Excessive spacer thickness can cause tire rubbing on fenders, increased stress on suspension components, and potential clearance issues with brake components or suspension parts.

Do I need different spacers for front and rear wheels?

Often yes, as front and rear wheels may have different offsets and clearance requirements. Always measure and calculate spacer needs for front and rear wheels separately.

Are hub-centric spacers better than wheel-centric spacers?

Hub-centric spacers are generally preferred as they center the wheel properly on the hub, reducing vibrations and ensuring proper load distribution. They provide a more secure and balanced fitment.