Калькулятор и сравнение размеров шин
Введите два размера шин, чтобы мгновенно рассчитать размеры, сравнить разницу, проверить погрешность спидометра и визуализировать изменения.
Tire 1 (Base Spec)
Tire 2 (Comparison Spec)
Quick Telemetry Summary
Detailed Dimension Comparison
| Measurement | Tire A (Stock) | Tire B (New) | Difference | Variance % |
|---|
Real-Time Visual Tire Comparison
Speedometer Accuracy Impact
Changing overall tire diameter alters distance traveled per wheel revolution, causing the vehicle speedometer to read differently from your true road speed.
| Indicated Speed | Actual Real Speed | Speed Delta |
|---|
Custom Speed Calibrator
Enter any cruising speed to compute the exact speed discrepancy:
Note: Calculations reflect nominal mathematical geometry. Actual road speed is also influenced by tire wear, rim width flex, pneumatic inflation pressure, and OEM speedometer factory calibration offsets.
Ride Height & Ground Clearance
The effective axle centerline moves up or down by exactly half of the total overall diameter variance (Δ Diameter / 2), shifting vehicle clearance and center of gravity.
Mathematically Compatible Alternative Sizes
These sizes maintain safe overall rolling diameter compatibility with your base tire while varying width and aspect ratio for alternate wheel configurations.
| Alternative Size | Width | Overall Ø | Diameter Delta | Match Level |
|---|
* Always verify fender clearance, wheel offset, and load index with your tire installer before mounting non-standard alternative sizes.
Plus Sizing Guide (+1" / +2" Wheels)
Increase wheel diameter for enhanced cornering response and sporty appearance while maintaining your vehicle's factory rolling diameter with lower-profile sidewalls.
| Candidate Size | Diameter | Variance |
|---|
| Candidate Size | Diameter | Variance |
|---|
Minus Sizing Guide (-1" / -2" Winter Setups)
Downsize rim diameter while using taller-profile tires to absorb potholes, improve ride comfort, and reduce winter tire costs without changing rolling circumference.
| Candidate Size | Diameter | Variance |
|---|
| Candidate Size | Diameter | Variance |
|---|
Understanding Tire Size Markings
Every standardized metric tire specification encodes four critical engineering parameters into a single standardized code.
Section Width (Millimeters)
The linear distance in millimeters from the widest point of the outer sidewall to the inner sidewall when mounted on a measuring rim at specified inflation pressure.
Aspect Ratio (Profile %)
The dimensional ratio of sidewall height to section width expressed as a percentage. In 205/55, sidewall height is 55% of 205 mm = 112.75 mm.
Internal Construction (Radial)
Indicates radial ply internal casing construction where steel and fabric cords run perpendicular (90 degrees) to the direction of travel for optimal traction and longevity.
Rim Diameter (Inches)
The nominal diameter of the wheel in inches from bead seat to bead seat that the tire is engineered to be mounted on (16" = 406.4 mm).
Часто задаваемые вопросы
How do I read a standard tire size (e.g. 205/55R16)?
A tire code consists of three principal dimensions: 205 is the section width in millimeters, 55 is the aspect ratio (sidewall height equals 55% of 205mm = 112.75mm), 'R' denotes radial construction, and 16 is the wheel rim diameter in inches.
What is the safe diameter variance rule of thumb?
Automotive engineers recommend staying within ±2% to ±3% of your OEM tire's overall diameter. Exceeding 3% can cause speedometer inaccuracies, ABS sensor faults, traction control interference, and fender clearance rubbing.
How does tire diameter affect the speedometer reading?
A larger diameter tire covers more distance per revolution, causing your speedometer to read slower than your true vehicle speed. A smaller tire covers less distance, making the speedometer read higher.
Automotive Fitment & Safety Advisory
Calculations presented on TireSizeChecker.com are nominal mathematical projections. Actual installed rolling dimensions fluctuate depending on rim width matching, tire manufacturing tolerances (TRA/ETRTO standards), pneumatic inflation pressure, dynamic speed expansion, and vehicle cornering loads.
Always verify mechanical suspension clearance, brake caliper clearance, wheel fender lip clearance, speedometer recalibration, and load/speed ratings with a certified tire technician before mounting non-OEM tire sizes.