Machined from white duracon material.
This spiral main gear T117 is designed for JR SYE12.

By combining with different pinion gears, you can choose from the following gear ratios:
T9 = 13:1
T10 = 11.7:1
T11 = 10.6:1
T12 = 9.75:1
T13 = 9:1

Weight:
JR T115 spiral main gear 62g
VJP T117 Spiral main gear 63g
JR T120 Spiral main gear 64.5g