The size code
Take 225/55R17 101W. Reading left to right:
- 225 — section width in millimetres.
- 55 — aspect ratio: the sidewall height is 55% of the width.
- R — radial construction.
- 17 — rim diameter in inches.
Load index and speed rating
The 101 is the load index and W the speed symbol. Load index 101 means 825 kg per tyre; W means the tyre is rated to 270 km/h. Both are set by ISO 4000-1, so they mean the same thing on any brand.
| Load index | Max load per tyre |
|---|---|
| 91 | 615 kg |
| 95 | 690 kg |
| 101 | 825 kg |
Where to check yours
Match the code on your current tyre against the size tables on each pattern page — every HILO pattern lists its full range of sizes with the load and speed rating for each one.
