Tire Size Calculator
🚗 Online Tire Size Calculator
Quickly calculate all characteristics of car tires from their markings. Find out diameter, width, sidewall height and other important parameters for proper tire selection.
🎯 How to use the calculator?
- Enter tire width (e.g., 205)
- Specify sidewall height as percentage (e.g., 55)
- Select rim diameter (e.g., 16)
- Get complete tire specifications
📏 What the calculator shows:
- Overall tire diameter — total wheel size
- Sidewall height — thickness of tire sidewall
- Circumference — wheel perimeter
- Revolutions per kilometer — for speed calculations
🔍 Tire Markings:
Standard marking looks like 205/55 R16, where:
- 205 — tread width in millimeters
- 55 — sidewall height as percentage of width
- R — radial construction
- 16 — rim diameter in inches
⚙️ Practical Applications:
- Tire selection: finding alternative sizes
- Wheel replacement: checking size compatibility
- Tuning: calculating impact on speed and consumption
- Car purchase: planning tire expenses
Frequently Asked Questions
What does 205/55 R16 marking mean?
205 mm - tread width, 55% - sidewall height from width, R - radial construction, 16 inches - rim diameter.
Can I use different tire sizes?
Yes, but wheel diameter shouldn't differ by more than 3%. The calculator helps check compatibility.
How does profile height affect driving?
Low profile (30-50%) - better handling but harsh ride. High profile (60-80%) - comfort but less precise handling.
Why know tire circumference?
For accurate speed and mileage calculations. Different circumference affects speedometer readings.
What are speed and load ratings?
Speed rating (H, V, W) shows maximum speed. Load index shows maximum weight per tire.
How to choose the right tire size?
Manufacturer recommended size is in car manual, on driver's door pillar, or fuel cap door.