Staggered Tire Size Calculator
Use a wider tire on the back than on the front. Use the calculator below. Results update as you type.
How the Staggered Tire Size Calculator Works
This calculator works by comparing a narrower front size with a wider rear size and reporting the diameter mismatch and width stagger. It suits rear-wheel-drive performance cars.
- Enter the front size, for example 245/40R19 (26.72 in).
- Enter the rear size, for example 275/35R19 (26.58 in).
- Read the diameter mismatch: −0.52%.
- Read the width stagger: +30 mm.
The Formula
The formula is Mismatch (%) = (Rear Diameter − Front Diameter) ÷ Front Diameter × 100.
Mismatch (%) = (D_rear − D_front) ÷ D_front × 100 Stagger (mm) = W_rear − W_front Overall Diameter = (Rim × 25.4) + 2 × (Width × Aspect Ratio ÷ 100)Worked example: 255/40R20 front (28.03 in) with 295/35R20 rear (28.13 in) gives +0.35% mismatch and 40 mm of stagger.
Conversion Table
The conversion table compares 8 front and rear pairs. Mismatches run from −1.36% to +0.35%, and stagger runs from 30 mm to 40 mm.
Most pairs drop the rear aspect ratio by 5 points to offset the extra width. That pattern keeps both axles within about 1% in diameter.
| Front | Rear | Front Dia (in) | Rear Dia (in) | Rear vs Front | Width Stagger (mm) |
|---|---|---|---|---|---|
| 225/40R18 | 255/35R18 | 25.09 | 25.03 | -0.24% | +30 |
| 225/40R19 | 255/35R19 | 26.09 | 26.03 | -0.23% | +30 |
| 245/40R19 | 275/35R19 | 26.72 | 26.58 | -0.52% | +30 |
| 245/35R20 | 275/30R20 | 26.75 | 26.50 | -0.96% | +30 |
| 255/35R19 | 285/30R19 | 26.03 | 25.73 | -1.13% | +30 |
| 245/40R18 | 275/35R18 | 25.72 | 25.58 | -0.54% | +30 |
| 255/40R20 | 295/35R20 | 28.03 | 28.13 | +0.35% | +40 |
| 275/35R20 | 305/30R20 | 27.58 | 27.20 | -1.36% | +30 |
What Is the Staggered Tire Size Calculator?
The Staggered Tire Size Calculator is a tool that checks a front and rear tire combination with different widths. A staggered setup puts wider tires on the driven rear axle for traction.
Staggered setups cannot rotate front to rear, so each axle wears on its own schedule. The calculator shows whether the diameters match closely enough for traction control and stability systems.
Common Uses
This calculator has 4 uses: performance builds, factory checks, replacement planning and stability-system checks.
- Plan performance builds: Choose a rear width for traction.
- Check factory setups: Confirm OEM staggered sizes.
- Plan replacements: Replace one axle without a mismatch.
- Check stability systems: Keep the mismatch small for traction control.