Can’t select gear type ? – Gear Speed - Brushless RC Speed Calculator Review

The app is excellent except for the most vital component, being able to to choose the gear type whether they are 48pitch or mod 1 gear size for example. That allows you to further calculate speed otherwise your calculations will always be off to some degree. Please fix this as all of my calculations were wrong, I found this out after I purchased a GPS and did a few passes on 4s on my rustler 2wd. Please fix, once corrected I will pull my review and re-do.
Review by NYKID158 on Gear Speed - Brushless RC Speed Calculator.