Quick Answer
- A staggered setup has different front and rear sizes. Ford's 2025 Mustang GT lists 255/40R19 (27.03 in) at the front and 275/40R19 (27.66 in) at the rear, 2.33% apart.
- The factory all-wheel-drive pairs in the Audi manuals we hold differ by 0.00% to 5.50%. No manual we read gives a tolerance percentage.
- Owners' manuals for all-wheel-drive cars ask for matching tires, and a staggered set cannot be rotated front to rear.
Driving a BMW with xDrive? The BMW xDrive tire tolerance calculator checks a front and rear pair against a 1% rolling diameter guideline.
Enter the front and rear tire sizes, for example 255/40R19 and 275/40R19, to compare their diameters and revolutions per mile.
Front diameter
27.03 in
746 rev/mi
Rear diameter
27.66 in
729 rev/mi
Difference
+0.63 in
16.0 mm
Difference %
2.33%
of the smaller tire
For comparison
The factory staggered all-wheel-drive pairs in the Audi manuals we hold differ by 0.00% to 5.50% (table below). Manufacturers publish no tolerance percentage, so check your owner's manual.
The rear turns 17 fewer times per mile than the front at the same road speed.
Get a plain-English explanation of your results and what they mean for your vehicle.
Factory Staggered Tire Sizes from Owner's Manuals
Front and rear sizes printed in the Ford Mustang 2025 and Audi USA owner's manuals, with diameters and the difference calculated.
| Vehicle (manual) | Drive | Front | Rear | Front dia. | Rear dia. | Difference | Difference % |
|---|---|---|---|---|---|---|---|
| Ford Mustang GT 2025 | RWD | 255/40R19 | 275/40R19 | 27.03" | 27.66" | +0.63" | 2.33% |
| Ford Mustang Dark Horse 2025 | RWD | 255/40R19 | 275/40R19 | 27.03" | 27.66" | +0.63" | 2.33% |
| Ford Mustang Dark Horse, handling package 2025 | RWD | 305/30R19 | 315/30R19 | 26.20" | 26.44" | +0.24" | 0.90% |
| Audi R8 Coupe / Spyder 2023 | AWD | 245/35ZR19 | 295/35ZR19 | 25.75" | 27.13" | +1.38" | 5.35% |
| Audi R8 Coupe / Spyder 2023 | AWD | 245/30ZR20 | 305/30ZR20 | 25.79" | 27.20" | +1.42" | 5.50% |
| Audi e-tron GT 2024 | AWD | 225/55R19 | 275/45R19 | 28.74" | 28.74" | +0.00" | 0.00% |
| Audi e-tron GT 2024 | AWD | 245/45R20 | 285/40R20 | 28.68" | 28.98" | +0.30" | 1.03% |
| Audi e-tron GT 2024 | AWD | 265/35R21 | 305/30R21 | 28.30" | 28.20" | -0.10" | 0.35% |
| Audi Q4 e-tron 2024 | AWD | 235/55R19 | 255/50R19 | 29.18" | 29.04" | -0.14" | 0.47% |
| Audi Q4 e-tron 2024 | AWD | 235/50R20 | 255/45R20 | 29.25" | 29.04" | -0.22" | 0.75% |
| Audi Q6 e-tron 2027 | AWD | 235/65R18 | 255/60R18 | 30.03" | 30.05" | +0.02" | 0.07% |
| Audi Q6 e-tron 2027 | AWD | 235/60R19 | 255/55R19 | 30.10" | 30.04" | -0.06" | 0.20% |
| Audi Q6 e-tron 2027 | AWD | 255/50R20 | 285/45R20 | 30.04" | 30.10" | +0.06" | 0.20% |
| Audi Q6 e-tron 2027 | AWD | 255/45R21 | 285/40R21 | 30.04" | 29.98" | -0.06" | 0.20% |
For the difference between any two sizes and the speedometer effect, use the tire size difference calculator. Wider rear wheels also change offset and stretch: see the wheel offset and backspacing calculator and the tire stretch and pinch calculator.
What Manufacturers Say About Different Front and Rear Tire Sizes
Summarized from owner's manuals and manufacturer pages. None of them gives a percentage tolerance.
| Source | Statement (paraphrased) |
|---|---|
| Ford Mustang 2025 manual | Lists different tire and wheel sizes for the front and rear positions (for example GT 255/40R19 on a 19 x 9 front wheel and 275/40R19 on a 19 x 9.5 rear wheel) and says to identify a wheel's position from its valve hole window, a smaller window on the front wheel and a larger one on the rear. |
| Audi owner's manuals | All four wheels must have the same brand, construction and tread pattern so the drive system is not damaged by different tire speeds. A different spare is for temporary emergency use only. |
| Subaru owner's manuals | Same size, circumference, construction, brand and load range on all four tires, with the same amount of wear. |
| Ford AWD manuals | Use the same size, load index, speed rating and type. Major size differences between axles can make the AWD system stop working or damage it. |
| Jeep Wagoneer 2022 manual | Proper operation depends on tires of equal size, type and circumference on each wheel. Any difference will adversely affect shifting and cause damage to the transfer case. |
| BMW Australia tyre FAQ | On xDrive models all four tyres should have as similar a rolling circumference as possible. We found no official BMW figure for a tolerance. |
More makers are covered in the AWD tire size guide.
How to Calculate Staggered Tire Diameter Difference
Overall diameter of each tire
Rim + 2 x width x aspect / 100 / 25.4. For 255/40R19: 19 + 2 x 102 / 25.4 = 27.03 in. For 275/40R19: 19 + 2 x 110 / 25.4 = 27.66 in.
Difference
Rear - front = +0.63 in (16.0 mm). As a percentage of the smaller tire: 2.33%.
Revolutions per mile
63,360 / (pi x diameter). Front 746, rear 729. At the same road speed the rear turns 17 fewer times per mile.
Why it matters on AWD
A tire of a different diameter turns at a different speed. Manufacturers of AWD cars ask for matching tires for this reason, and some factory staggered cars (the table above) are built with a small, fixed difference.
How to Use the Staggered Tire Calculator
- 1Type the front tire size and the rear tire size, for example 255/40R19 and 275/40R19, or tap one of the factory pairs.
- 2Read the front and rear diameter, the difference in inches, mm and percent, and the revolutions per mile of each.
- 3Compare the percentage with the factory pairs in the table and read what your manufacturer says about mixing sizes.
- 4Check the wheel widths and offsets of each axle separately, and have the fitment confirmed before you buy.