Originally Posted by terryh1313
Hello all. I have a 17.5 and need a idea on what size spur gear an pinion gear,I need. trying to run VTA this weekend. Thanks in advance
I run a TC3 in RCGT. I have my FDR anywhere from 4 to 3.5.
For FDR of 4.0 you need 75T spur (64P) & 47T pinion.
For FDR of 3.75 you need 75T spur & 50T pinion.
For FDR of 3.5 you need 75T spur & 53T pinion.
I would try 4.0 first.