[Gear Ratio calculator]
Black CTS-V: Gear Ratio Calculator

Here is a cgi I wrote to do gear ratio calculations. You can use it to try out different rear end gears and tire sizes. Note that there are two ways of entering the tire size. Be sure to check the radio box next to the method you want to use.

This table shows the specs for my 2014 CTS-V which has the Tremec TR-6060 six speed manual transmission (RPO MN6) and 3.73 gears (RPO GT4):

CTS-V with MN6 manual and 3.73 gears

Gear Ratio Final MPH @
1 9.92 47.7 6923
2 6.64 71.2 4633
3 4.85 97.5 3383
4 3.73 126.8 2603
5 2.98 158.5 2082
6 2.35 201.3 1640
R 10.82 43.7 7548
Axle ratio
Wheel diameter inches
Wheel circumference inches
Revolutions per mile
Tire size /- (mm/%-inch)

Here are tables for some other configurations:

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Craig Leres