This is the real 928 gear calculator, written specifically for the 928, by a 928 owner.

My program does it all for you if you know the year of your car (well, more specifically, the year of the transaxle in your car) and the size of the tires/wheels that you're running.

The output will also show the initial engine rpm of each successive gear as you complete each shift.

Enter tire height in percentage (ie. 50):

Enter rim diameter (ie. 17):

Enter rev limit (ie. 6200):

Enter the 4 digit manufacture year of the transaxle (ie. 1987):

For the output of this program, by how many rpms should each data point be seperated?(ie. 100):