The Tyre Size Code

A typical tyre size code looks like this: 205/55R16 91V. Each part means something specific. "205" is the tyre width in millimetres. "55" is the aspect ratio — the height of the sidewall as a percentage of the tyre width (so 55% of 205mm). "R" means radial construction. "16" is the rim diameter in inches.

Getting the right size is critical — fitting a tyre with the wrong width, aspect ratio, or rim size can affect handling, speedometer accuracy, and safety. Always refer to your vehicle handbook or the current tyre sidewall when ordering replacement tyres.

Load Index and Speed Rating

The numbers and letter at the end of the size code indicate load capacity and speed rating. "91" is the load index — a numeric code indicating the maximum weight the tyre can support (91 = 615kg per tyre). "V" is the speed rating — the maximum sustained speed the tyre is designed for (V = 240km/h).

Never fit a tyre with a lower load index or speed rating than specified for your vehicle. Higher-rated replacements are generally acceptable, but check your vehicle manufacturer's guidance.

Other Important Tyre Markings

Look for "XL" or "RF" for reinforced/extra load tyres (common on vans and SUVs), "RFT" for run flat tyres, and the EU tyre label rating which covers fuel efficiency, wet grip and noise. The DOT code gives you the manufacturing date in the last four digits.

If you're unsure about which tyre you need, call Easy Mobile Tyres. Give us your vehicle registration or read us the size from your current tyre, and we'll identify and supply the correct replacement.