Originally Posted by Josh H

The internal for the tc5 is 2.0
Gearing depends on track size and what type of motor and speedo.

With that being said......I gear my Trinity duo 13.5 at 100/41 which is 4.88 this is on a 100 x 50 track
For a Trinity 17.5 duo I gear at 100/45 which is a 4.44
I use an lrp speedo with full punch.

Josh Hohnstein