change tires from 19 to 22

Not sure what trans you have, but changing tire size can really mess up the shift points. I do know someone who went up in diameter with the Allison 6 speed and his shifting was really messed up. Of course transmissions can be reprogrammed.

Goldencrazy wrote:
I notice that people change the tire diameter on cars frequently and in fact we increased the diameter of our tires by 1 inch on our Smart Car and some folks increased by 2 inches. That is all the wheel wells will tolerate. For me the tires were also wider. Made for better ride and stability. I understand that coaches with the 22 inch tires ride better. I seem to have plenty of wheel well room on my Vista 30T. Why shouldn't I consider increasing the diameter when time to change tires. I understand that width might be a problem if I increased because of distance between duals. Any thoughts?