One is greater than two. The planetary gear mechanism at the hart of Truvativ’s new front transmission works like a single chainring with the strengths of the traditional two-ring system — and none of the weaknesses. There are two gears: 1:1 and Overdrive. In 1:1, everything is locked and spinning together. Turn the pedal once and the chainring goes around once. In Overdrive, the ratio is approximately 1:1.6. Turn the pedal once and the chainring goes around about 1.6 times.