Winter Wheel Package Calculator
Plan a set of winter wheels and tires. Use the calculator below. Results update as you type.
How the Winter Wheel Package Calculator Works
This calculator works by taking the summer size and finding Minus-1 and Minus-2 sizes that keep the same overall diameter. It shows both options side by side.
- Enter the summer size, for example 235/40R19.
- Read the Minus-1 option: 215/50R18 at +0.24%.
- Read the Minus-2 option: 215/55R17 at −0.34%.
- Confirm the smaller wheel clears the brake calipers.
The Formula
The formula applies Sidewall_new = Sidewall_summer + N × 12.7 mm for N = 1 and N = 2.
Rim_winter = Rim_summer − N Sidewall_winter (mm) = Sidewall_summer + N × 12.7 Change (%) = (D_winter − D_summer) ÷ D_summer × 100Worked example for 225/45R18: sidewall is 101.25 mm. Minus-1 needs 113.95 mm; on a 205 mm width that is 55.6%, giving 205/55R17 at −0.36%.
Conversion Table
The conversion table gives Minus-1 and Minus-2 winter sizes for 8 vehicle types. All 16 options sit within ±0.52% of the summer diameter.
Narrower widths appear in the sedan, sport sedan, crossover, compact SUV and hatchback rows. A narrower tire presses harder into snow and slush per square inch of contact.
| Vehicle Type | Summer Size | Winter −1 | Change | Winter −2 | Change |
|---|---|---|---|---|---|
| Sedan | 225/45R18 | 205/55R17 | -0.36% | 195/65R16 | +0.03% |
| Sport sedan | 235/40R19 | 215/50R18 | +0.24% | 215/55R17 | -0.34% |
| Crossover | 245/45R19 | 245/50R18 | -0.13% | 225/60R17 | -0.18% |
| Compact SUV | 235/55R19 | 235/60R18 | -0.26% | 205/75R17 | -0.24% |
| Mid-size SUV | 255/50R20 | 255/55R19 | +0.01% | 255/60R18 | +0.03% |
| Large SUV | 275/50R21 | 275/55R20 | +0.26% | 275/60R19 | +0.52% |
| Hatchback | 225/40R19 | 205/50R18 | -0.06% | 195/60R17 | +0.48% |
| EV SUV | 265/45R21 | 265/50R20 | +0.14% | 265/55R19 | +0.29% |
Check that the smaller wheel clears the brake caliper before ordering a Minus-2 package.
What Is the Winter Wheel Package Calculator?
The Winter Wheel Package Calculator is a tool that plans a dedicated set of winter wheels and tires for a car, crossover or SUV. A winter package is a second set of wheels mounted with winter tires and swapped on each season.
Smaller wheels cost less, winter tires in smaller sizes cost less, and a taller sidewall protects the rim from frozen potholes. The calculator finds sizes that keep factory speedometer and ABS calibration.
Common Uses
This calculator has 4 uses: package planning, cost comparison, snow performance and EV range protection.
- Plan packages: Pick the winter wheel and tire size.
- Compare costs: Price Minus-1 against Minus-2 options.
- Improve snow traction: Choose narrower widths for deep snow.
- Protect EV range: Keep diameter close to stock for accurate range readings.