Reading a tyre size like 205/55 R16 91V looks cryptic. This page decodes it, checks your load & speed ratings, and lets you buy the correct tyres from UK Tyre Centre.
Tyre size decoder
Type your size (e.g. 225/45 R17 94W XL) and we’ll decode it. Then click through to see matching tyres.
What each part means
- Width (205) – section width in mm.
- Profile (55) – sidewall height as % of width.
- Construction (R) – radial casing (almost all modern tyres).
- Rim (16) – wheel diameter in inches.
- Load index (91) – max load per tyre (≈ 615 kg for 91).
- Speed rating (V) – max tested speed (≈ 149 mph for V).
- XL / Reinforced – higher load capability; common on SUVs/EVs.
- Run-flat – can drive short distance after puncture; requires compatible wheels/TPMS.
- OE marks – car-maker tuned variants (e.g., AO, * , MO).
Common quick sizes
195/65 R15205/55 R16225/45 R17225/40 R18235/45 R18255/45 R20
