Tire size

Years ago, I switched from the 12" tire to the 165/65/13 tire on my '92 Metro. I am now shopping for tires and have been informed that the 165/65/13 tires are being discontinued and the only commonly available size close is the 185/60/13.

There are many other sizes available that will fit the rim / body, but they seem to be either bigger or smaller that it will affect the speedo accuracy.

Is there any way of recalibrating the speedo to compensate?
Thanks,

No easy way to adjust the speedometer that I know of but I wouldn't worry about it. When your speedometer says 60, you'll be going 61.7mph. Incidently, your old tires weren't right either. They were at 60.9mph. You need to be worry more about width than height, 185 is pretty wide if you're using stock Metro wheels, they're going to want a 5.5 inch rim.