Tire & Wheel Professional Tech Suite
Compare two tire sizes side-by-side to calculate overall diameter differences and see equivalent sizes.
| Dimension | Tire 1 | Tire 2 | Difference |
|---|
Click any compatible alternative size below to load it automatically as Tire 2.
Enter a tire size to view its overall dimensions and search for alternate equivalent sizes across different wheel rim diameters.
Select a wheel diameter to view equivalent tire sizes within safety limits (±3.0% deviation):
Convert standard metric tire dimensions to equivalent flotation measurements in inches, and vice-versa.
Calculate how shifting wheel width and offset affects strut clearance and fender outer extension.
Compare real vehicle speed versus indicated speedometer speed due to changes in tire size diameter.
When your speedometer reads the indicated value, your actual speed (accounting for tire height deviation) is listed on the right.
| Speedometer Reading | Actual Speed (Tire 1) | Actual Speed (Tire 2) | Difference |
|---|
Your speedometer will read slightly slow compared to your actual speed.
Calculate engine RPM at highway speed, or find the ideal axle gear ratio matching after larger tire upgrades.
Calculate correct safety inflation pressure when upgrading standard passenger tires to heavy-duty LT (Light Truck) tires.
LT (Light Truck) tires carry less weight at lower pressures than passenger car tires. You MUST raise the air pressure to maintain equivalent vehicle load support.
| Tire Class | Standard PSI Range | Safety Note |
|---|---|---|
| P-Metric | 30 - 35 PSI | Standard passenger car rating comfort levels. |
| LT Load Range C | 35 - 50 PSI | Requires slightly higher inflation pressure. |
| LT Load Range D | 50 - 65 PSI | Required for heavier load-carrying capacities. |
| LT Load Range E | 65 - 80 PSI | Heavy duty. DO NOT under-inflate below equivalent load index. |
Reference guide demonstrating lug configurations and showing pitch circle diameters (PCD).