How to Read Tire Size (205/55 R16) — Explained Step by Step
Confused by tyre markings like 205/55 R16? This guide explains what each number means and how to choose the right tires.
Tyre size markings like 205/55 R16 tell you four key things: width, profile (sidewall height), construction type, and rim diameter. In the next sections, we’ll break down each part in plain English and show you how to calculate the sidewall height, so you can confidently choose the correct tire size.
Tyre size format
The standart format look like this : 205/55/16 What this mean?
Width — 205
205 is the tire width in millimeters. It means the tire is 205 mm wide from sidewall to sidewall.
Profile — 55 (with calculation)
Profile / Aspect Ratio (55)
55 means the sidewall height is 55% of the tire width.
Example: 205 mm × 0.55 ≈ 113 mm sidewall height.
Construction — R
Construction (R)
R stands for radial construction, which is standard for modern passenger cars.
Rim diameter — 16
Rim Diameter (16)
16 is the wheel (rim) diameter in inches. This tire fits only a 16-inch rim.
Quick recap
Quick recap:
• 205 = width (mm)
• 55 = sidewall height (% of width)
• R = radial construction
• 16 = rim diameter (inches)