Truck Tire Size Comparator
Compare metric LT and flotation truck tire sizes side by side. See height, width, percent gap and ride height change in inches and mm.
Compare metric and flotation truck sizes.
Truck Tire Size Comparator: Tire Size Inputs
Compare two tire sizes here. Use the formulas and reference tables below for this tool's specific calculation.
How Truck Tire Size Comparator Works?
The Truck Tire Size Comparator works by converting metric LT sizes and flotation sizes into the same inch and millimeter units and comparing height, width and lift. The tool uses 4 steps.
Enter the stock size
Type the factory size, for example LT265/70R17.
Add metric or flotation candidates
Type any mix of sizes, for example LT285/70R17 and 35x12.50R17.
Normalize units
The comparator converts every size into height and width in inches and millimeters.
Compare lift and fit
The comparator shows the percent height gap and the ride height gain, equal to half the diameter gain.
Truck Tire Size Comparator Formula
The Truck Tire Size Comparator formula for a flotation size is OD = D × 25.4, and for a metric size OD = 2 × W × AR ÷ 100 + Rim × 25.4.
OD = D_in × 25.4OD = 2 × W × AR ÷ 100 + Rim × 25.4Δh = (OD₂ − OD₁) ÷ 2- D_in
- Flotation diameter (in)
- W, AR, Rim
- Metric width, aspect ratio, rim
- Δh
- Axle height change (mm)
Worked example
Stock LT265/70R17 is 31.61 in tall. A 35x12.50R17 tire is 35 in (889 mm) tall, a gap of +10.74%. The axle rises 43.1 mm (1.70 in).
Truck Tire Size Comparator Conversion Table
The Truck Tire Size Comparator conversion table compares 6 metric and flotation upgrades against an LT265/70R17 stock tire.
| Size | Height | Width | Height gap | Ride height change |
|---|---|---|---|---|
| LT265/70R17 | 31.61 in | 265 mm (10.43 in) | +0.00% | +0.0 mm |
| LT285/70R17 | 32.71 in | 285 mm (11.22 in) | +3.49% | +14.0 mm |
| LT315/70R17 | 34.36 in | 315 mm (12.40 in) | +8.72% | +35.0 mm |
| 33x12.50R17 | 33.00 in | 317.5 mm (12.50 in) | +4.41% | +17.7 mm |
| 35x12.50R17 | 35.00 in | 317.5 mm (12.50 in) | +10.74% | +43.1 mm |
| LT295/70R18 | 34.26 in | 295 mm (11.61 in) | +8.40% | +33.7 mm |
| 35x12.50R20 | 35.00 in | 317.5 mm (12.50 in) | +10.74% | +43.1 mm |
What is Truck Tire Size Comparator?
A Truck Tire Size Comparator is a tool that compares pickup, SUV and off-road tire sizes written in metric LT or flotation format. Truck tire shopping mixes both formats, which makes direct comparison hard without a converter.
Truck upsizing often exceeds ±3%. The comparator reports the full gap so the owner can plan speedometer recalibration, gearing and lift.
Width matters as much as height on trucks. A 12.5-inch (317.5 mm) tire is 52.5 mm (2.07 in) wider than a 265 mm tire, which adds about 26 mm (1.03 in) per side.
What are the uses of Truck Tire Size Comparator?
There are 4 main uses of the Truck Tire Size Comparator, including lift planning and mixed-format shopping.
Lift planning
Match tire height with the lift kit's maximum tire size.
Mixed-format shopping
Compare metric and flotation listings in one table.
Regear decisions
See whether the height gain calls for new axle gears.
Trim and rub checks
Estimate added width per side before test fitting.
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