Gear Ratio / RPM / Speed Calculator
Determine Speed: Use this calculator when you know your gearing and want to find your Speed at a given RPM
Determine RPM: Use this calculator when you know your gearing and want to find your RPM at a given speed
Determine Ratio: Use this calculator when you know your final drive, but want to find your Gear Ratio for a given RPM & speed.
Note: The circumference of the tire is computed for an ideal circle for the
given tire dimensions.
You can use the "adjustment (%)" to raise
or lower this by a percentage as you see appropriate
B5 S4 6speed gearing is:  VW 1.8T trannys coded: EBQ, EMT, EGX, FBW 

Gear Ratios:  Manual (Automatic)  Manual 
1st  3.500:1 (3.665:1)  3.300 
2nd  1.889:1 (1.999:1)  1.944 
3rd  1.231:1 (1.407:1)  1.308 
4th  0.967:1 (1.000:1)  1.029 
5th  0.806:1 (0.742:1)  0.837 
6th  0.684:1 ()  
Reverse  3.455:1 (4.096:1)  
Final Drive  4.111:1 (3.511:1)  3.938 
The above is the S4 (6speed manual) gearing (RPM vs Speed) per data logging using APR's ECU Explorer. The bold areas are the actual datapoints logged, whereas the thin lines is the linear trendline with 0intercept.