There definitely is a gearing problem with some of these NuVinci bikes. I always suspected it, but can't be sure, thinking it could be due to headwind or maybe the jeans I am wearing were too grabby. But the last one I rode, I was spinning like mad and thought I don't feel like I am going that fast, so I pulled up next to someone riding the new 3 speed ones, and I am definitely doing a higher RPM.

Then as I docked, I gave it a rough measure of how many wheel turns I will get for every turn of the crank, and it was around 2.4. Then I grabbed went to another NuVinci bike and measured something like 3.3. From now on, if I encounter a NuVinci whose highest gear feels low, I will press the wrench button. Or maybe I won't even take one of these bikes out, since the chance of getting stuck with a low geared bike seems pretty high.