Wheelia is an Android app for finishing the wheel and tire fitment math before you buy. Enter your current wheel, the gap you measured from the fender, and the wheel you are considering, and you get how many mm it moves outward and what the gap becomes. The result is worked out from your measured gap, so small errors in the fixed dimensions have little effect on the answer. Aim for flush, or 5 mm of gap left, and get the offset or spacer thickness you need. Tire size compare, plus sizing, camber, bore and PCD, and load index are built in too. Made and published by GRAMSHIFT.
What you can do with Wheelia
Fitment: poke and fender gap
Enter the wheel you are considering and see how many mm it moves outward and what the gap becomes. Tire face and wheel face are shown as two separate figures.
Tire size compare
Overall diameter, circumference, ride height change and speedometer error. It also gives your true speed at a reading you choose.
Save setups in My wheels
Save your current setup and the ones you are considering, with a name, and bring them back later. Up to three without the purchase.
From measurement to fitment
- Enter your current wheel and gap. Rim diameter, rim width, offset, tire size, and the gap you measured from the fender.
- Enter the wheel you want. See how many mm it moves outward and what the gap becomes, with tire and wheel protrusion shown separately.
- Work backwards from a target. Pick flush or a gap to keep, such as 5 mm, and get the offset you need or the spacer thickness for the wheel you already have.
Free and the one-time purchase
- Every calculation is free. The fitment result, the table by offset, the cross-section drawing and how far the inner face moves toward the suspension are all there without paying.
- A small banner sits at the top of the screen, with no full-screen ads. Watch one short video and the ads go away for 60 minutes (nothing plays unless you tap it).
- One-time purchase (a single payment): stops the ads for good and takes My wheels to 50 saved setups (free keeps 3).
- Setups saved in My wheels stay on your device unless you send them yourself.
Frequently asked questions
How do I know if new wheels will stick out past my fenders?
Enter your current wheel, the gap you measured from the fender and the new wheel. Wheelia shows how many mm the new wheel moves outward and what the fender gap becomes.
What offset do I need for flush fitment?
Set your target, such as flush with the fender or 5 mm of gap left, and Wheelia works out the offset you need. It also gives the spacer thickness if you keep the wheel you already have.
Can I calculate the wheel spacer size I need?
Yes. Work backwards from your target gap and Wheelia gives the spacer thickness for your current wheel.
How much will bigger tires throw off my speedometer?
Tire size compare shows the speedometer error along with overall diameter, circumference and ride height change. It also gives your true speed at a reading you choose.
How much does camber move the top and bottom of the wheel?
Enter the angle and Wheelia calculates how far the top edge moves inward and the bottom edge moves outward, in mm.
Will this tell me if my car passes inspection?
No. Wheelia does not decide whether a vehicle passes inspection. Use it to check the numbers; the final judgement rests with the inspection.
Is Wheelia free?
Yes. Every calculation is free, with a small banner ad at the top and up to three saved setups. A one-time purchase removes the ads for good and raises saved setups to 50.
Good to know
- There is no database of factory wheel sizes by car model. Take the figures from the markings on the wheel and the tire sidewall.
- It does not decide whether a vehicle passes inspection.
- Values that are only estimates, such as tire width on a non-standard rim, are labelled as estimates and shown as a range.
- Prices and labor rates are not included.
If something does not work, or you have an idea or a request, feel free to write to us through the contact form or at contact