AVEO speedometer calibration;14" vs 15" wheels.

[kcROB]

You are right on....the 185/55-15 compared to the stock 14 came out only 1.2% difference: 887 rev/mile(14"); 876/mile (15") . When I locate an extra wheel and buy premium tires, I will consider an aspect ratio that will yield fewer rev/mile for longer life, better mpgs. Looks like as one increases the aspect ratio, the rev/mile decreases, but what about the handling? Will need to do some research...might go to an a.r. of "65" x 15. Thanks for the calculator and say warm!!