Which tyre should you choose for your 2CV?
There are many opinions and just as many opinions on this.
Let's start with the basics, what is the difference in the commonly used tire size 125/80R15 and 135/80R15?
| 125/80R15 | 135/80R15 | difference | |
| Diameter in mm | 581 | 597 | 16 = 2.8% |
| Width in mm | 125 | 135 | 10 = 8% |
| Afwenteling in mm | 1825.27 | 1875.53 | 50.27 = 2.8% |
| Cheek height in mm | 100 | 108 | 8 = 8% |
| Number of rotations per km | 547.86 | 533.18 | -14.68 = -2.7% |
Tires crossed and placed side by side. The facts in a row: the height difference between the tyres is only 16mm and a tyre of 135/80R15 could in theory last longer, because the tyre makes fewer revolutions per kilometre driven.
What we do have to take into account is the deviation between the actual speed and the speed indicated by the speedometer (although it is also not calibrated.) when we change the tyre size to 135/80R15:
| Snelheidsmeterverschil | |
| Speedometer read | Actual speed |
| 30 km/h | 30.83 km/h |
| 40 km/h | 41.11 km/h |
| 50 km/h | 51.38 km/h |
| 60 km/h | 61.66 km/h |
| 70 km/h | 71.93 km/h |
| 80 km/h | 82.21 km/h |
| 90 km/h | 92.48 km/h |
| 100 km/h | 102.76 km/h |
| 110 km/h | 113.58 km/h |
| 120 km/h) | 123.3 km/h |
| 130 km/h) | 133.58 km/h |
