speedo gear??

Sorry for taking so long to get back to you Sparky, I was away.
Basicly this is how the tire thing works.

You have 245/60/15's

the 245 is the width of your tire. 245mm or 24.5cm or 9.646 inches
the 60 is the height of the sidewall expressed in % of tire width or 9.646 x .60= 5.787 inches.
the 15 is wheel height in inches.
so you have 5.787+5.787+15 = 26.57 inch tires

Use this number (26) and your gear size in the chart and you will see what speedo gear you need.

Jack