Does the calculator account for wheel width and offset?

No. It calculates nominal tyre geometry; wheel width, offset, centre bore, fixings and arch clearance are not assessed.

Why can actual tyre diameter differ from the calculation?

The formula uses nominal markings. Brand, model, wheel width, pressure, load and tread wear alter the real dimensions.

Comparador de medidas de neumáticos

Introduce dos medidas

Medida actualMedida de referencia

Medidas del neumático

Anchura Perfil Llanta

Medida nuevaMedida que estás valorando

Medidas del neumático

Anchura Perfil Llanta

205/55 R16 means a 205 mm width, 55% aspect ratio and 16-inch rim.

Diferencia mínima

205/55 R16 → 225/45 R17

Cambio de diámetro+0,38 %

Comparación visual

205/55 R16Actual

225/45 R17Nueva

Cambios principales

Altura libre+1,2 mmthe vehicle would theoretically rise

Velocidad real100,4 km/hwhen the speedometer shows 100 km/h

Distancia real100,4 kmwhen the odometer records 100 km

Comprueba otra velocidad indicada

km/h

Comparación detallada de medidas

Nominal theoretical dimensions calculated from the tyre marking.

Dato	205/55 R16	225/45 R17	Diferencia
Anchura del neumático
Altura del flanco
Diámetro de llanta
Diámetro exterior
Circunferencia teórica
Vueltas por kilómetro

Diferencia del velocímetro

Theoretical road speed if the vehicle was calibrated for the first tyre size.

Velocímetro	Velocidad real teórica	Diferencia

Important: this calculation isolates the effect of nominal tyre size. Factory calibration, pressure, load, tread wear and actual model dimensions also affect the reading.

Herramienta adicional

Medidas de neumáticos equivalentes

Using 205/55 R16 find the closest nominal-diameter options for your chosen rim.

Mathematically close diameter options for rim R17. This does not confirm availability or suitability for a particular vehicle and wheel.

Medida del neumático	Diferencia de diámetro	Altura libre	Speed at 100 km/h	Acción

¿Cómo comparar medidas de neumáticos?

From the sidewall marking to clear diameter and speedometer changes

Find your current size

Check the tyre sidewall or vehicle placard and enter a size such as 205/55 R16.

Enter the new size

Select the size you are considering; the standard 225/45 R17 format is used.

Compare the changes

Review sidewall height, diameter, circumference, clearance, revolutions and theoretical speedometer readings.

Check the vehicle documents

A mathematically close size is not automatically suitable. Always use sizes approved by the vehicle manufacturer.

¿Qué significa 205/55 R16?

Three main numbers describe the nominal tyre dimensions

205/55R16

205 – width

Nominal section width in millimetres.

55 – aspect ratio

The sidewall height is 55% of the width: 112.75 mm here.

R16 – construction and rim

R means radial construction and 16 is the rim diameter in inches.

Comparativa 205/55 R16 y 225/45 R17

Preguntas frecuentes sobre medidas de neumáticos

Answers about sidewall height, changing R16 to R17, speedometer difference and equivalent sizes

How do you calculate tyre sidewall height?

What is the difference between 205/55 R16 and 225/45 R17?

Which tyres can replace 205/55 R16?

Can R16 tyres be changed to R17?

How does tyre size affect the speedometer?

What tyre-diameter difference is acceptable?

How does ground clearance change?

Does the tool check wheel width and offset?

Why can actual tyre size differ from the result?

Does the calculator save entered sizes?