can the dealer recalibrate the speedometer for a new tire size?
for instance 235/45 from the stock 225/50?

 

No.

 

short, quick, and to the point.

 

Not worth it anyway. From stock tires to 235/45-17, your speedo is only 2% faster. This translates to. . . If your speedo says 100, you're really only doing 98mph. Not a big enough difference to worry about. After putting 10,000 miles on your odometer, it is really only 9,800.

 

check this spreadsheet out....it has speedo error at various speeds:

http://www.glue.umd.edu/~nauman/tire.xls

 

Or check this one out.....
http://www.miata.net/garage/tirecalc.html

Not to steal your thunder or anything UMD...all I have to say is....

 

hehehe.....it's all good...