This is also what most of the teams whom we've ridden with or know who ride daVinci tandems report. Riding out-of-sync is something that seems to occur under just a couple of different scenarios:

1. Intentionally on long seated climbs
2. When one rider decides to coast or soft pedal for a break
3. When one rider becomes fatigued and unitentionally soft pedals**
4. When a kid-back is riding and does what ever it is that kids do on the back of tandem when not required to stay-in-sync.**
5. When riding technical single track off-road and negotiating hazards.

**This is a blessing in disguise to captains who might otherwise find themselves pushing their stoker's feet around.