Hello forum, the Smart 451 with the tyres VA 155 and HA 175, should get all-weather tires. Since my wife is driving only relatively short distances, I would like to keep a 155er as a spare wheel. I don’t think of these breakdown sets and most of the time she is not so far away that you could not drive with the spare wheel to her. Taking with you would be silly. Now my question: Is it technically possible to drive the 155er for a few kilometers on the rear axle? With my Astra with 245er is also such an emergency bike, which is even narrower than the 155er from the Smart and is allowed. Can anyone say anything about this?