how to set tires size with hpt ... 99 C5 corvette 427 YSi

[driver240]

hello , i would like to know how to change the tires size with hpt ,
i just bought some MT drag radial 2 on 295-55-17 , they are 27,2 inch dia and would like to change it in the tune..

[danieloneil01]

Speedo -> Gear/Tire Calc

[driver240]

ok thanks , so i set 27,2 for the tires size and 3,42 for the gear and commit the change and save it ...
will try it ..!!

[driver240]

i will check if it change something for my reduce power mode ...