- Size Calculator
- Tire Size Comparison
- Speedometer Calculator
- Gear Ratio Calculator
- Offset Visualizer
- Tire Pressure Calculator
- Load Index & Speed Rating
- Tire Wear Analysis
- Cost Comparison Tool
- Tire Size Charts
Tire Size Calculator
Results
- Sidewall Height: mm
- Overall Diameter: mm
- Circumference: mm
- Revolutions per KM: rev/km
Tire Size Comparison
Comparison Results
Visual Size Comparison
Original Tire
New Tire
| Parameter | Difference | Unit |
|---|---|---|
| Sidewall Height | mm | |
| Overall Diameter | mm | |
| Circumference | mm | |
| Revolutions per KM | rev/km | |
| Overall Diameter Change | % |
Speedometer Impact
At 100 km/h your actual speed will be:
Industry Standard - Maximum Allowable Differences
| Parameter | Maximum Difference | Industry Standard |
|---|---|---|
| Overall Diameter Difference | ±3% | Most Critical |
| Sidewall Height Difference | ±15mm | Acceptable |
| Circumference Difference | ±63mm | Critical for Speed |
| Revolutions per KM | ±30 rev/km | Speedometer Accuracy |
⚠️ Safety Warning
The tire size difference exceeds industry standards. This may cause speedometer inaccuracy, handling issues, or damage to vehicle systems.
✅ Compatible Size
This tire size change is within acceptable industry standards and should be safe for your vehicle.
Important Notes & Explanations
- 3% Rule: The most critical measurement is overall diameter difference. Industry standard recommends staying within ±3% to maintain vehicle safety and performance.
- Speedometer Accuracy: Larger tires will make your speedometer read slower than actual speed. Smaller tires will make it read faster than actual speed.
- Plus Sizing: When upgrading to larger rims, choose tires with lower sidewall height to maintain similar overall diameter.
- Vehicle Systems: Significant size changes can affect ABS, traction control, and electronic stability systems calibration.
- Load Rating: Always ensure new tires have equal or higher load rating than original tires.
- Professional Advice: Consult with tire professionals before making significant size changes, especially for commercial or high-performance vehicles.
Speedometer Calculator
Result
Actual Speed: km/h
Difference from Displayed Speed: km/h
Gear Ratio Calculator
Results
- Effective Gear Ratio:
- New Ratio Compared to Original:
Offset Visualizer & Converter
Original Setup
New Setup
Results
- Inner Clearance Change: mm
- Outer Position Change: mm
Tire Pressure Calculator
Recommended New Pressure
- Diameter Change:
- Pressure Difference:
Note: We should measure tire pressure when it's cold,
Always verify pressure based on vehicle label and tire rating.
Safety Reminder: Check tire pressure monthly and before long trips. Proper pressure improves fuel economy, tire life, and safety.
Load Index & Speed Rating Calculator
Load Index & Speed Rating Information
- Load Index:
- Speed Rating:
- Maximum Load (lbs):
- Maximum Speed (mph):
Safety Information
Load Index: This is the maximum weight each tire can safely carry when properly inflated.
Speed Rating: This is the maximum speed the tire can sustain for extended periods under ideal conditions.
Tire Wear & Life Calculator
Tire Wear Analysis
- Current Wear: mm
- Remaining Tread: mm
- Tire Condition:
- Projected Total Life:
⚠️ Safety Warning
Maintenance Tips
- Check tire pressure monthly for even wear
- Rotate tires every 8,000-12,000 km for longer life
- Check wheel alignment if wear is uneven
- Replace tires when tread depth reaches 1.6mm (legal minimum)
Tire Cost Comparison Tool
Compare up to 3 tire options to find the best value for your money.
Tire Option 1
Tire Option 2
Tire Option 3 (Optional)
Cost Comparison Results
🏆 Best Overall Value
💰 Lowest Initial Cost
Analysis Notes
- Cost per km includes tire price divided by expected lifespan
- Treadwear rating is used to estimate tire lifespan (higher = longer lasting)
- Best value considers both initial cost and longevity
- Actual tire life may vary based on driving habits and conditions
Professional Tire Size Charts by Wheel Size
Available Tire Sizes
Please select a wheel diameter to view available tire sizes.
Tire Size Information
Saved Results
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