Tron Helicopters 6mm Mod 0.7 Pinion gears are the exact match with the original 135 tooth main gear (TR503-135) found in the Tron 5.5E. Offered in a wide variety of tooth counts to fit your needs for gearing and headspeeds depending on equipment choice.
Gearing Charts:
13T: 10.38:1
14T: 9.64:1
15T: 9.0:1
16T: 8.44:1
17T: 7.94:1
This product was added to our catalog on June 4, 2021