Because the patent describes seven speeds 19-to-41 cassettes, a thirteen-speed system with a 470% gear range is the result. Not much compared to 526% of Rohloff or a range of Pinion gearboxes which goes up to 636% for Pinion P1.18. Even today a conventional cassette of 10 to 50 teeth has a larger range. In general, it seems that the problem may also be the efficiency of the whole power transmission, which, according to some calculations, could be around 89%, which is again significantly worse than 95 to 96% of the classic shifting with derailleur, 94.5% for Rohloff or 90,5% for the Pinion. However, Shimano wants to solve this problem by an oil bath with a specially developed lubricant, which is given considerable attention in the patent. Also newly developed inner chain surface that should minimize friction.
So where is the potential advantage? For upright bicycles, the main advantage is in the weight being moved towards the center of the bike itself and also in having it on the suspended part of the bike as well as in the complete transmission housing, which becomes almost maintenance-free. Shimano assumes only modern electronic shifting. However, the advantage for recumbent seems to be fairly low right now.
Overall, the enthusiasm of the professional public is considerable. Some even talk about a possible breakthrough in the future of bicycle shifting, because the issue of “gearboxes” is targeted by the biggest player in the world of bicycle components. Also, the level of detail of the whole patent suggests that Shimano is already deep in the whole development and that it is perhaps close to the launch of the system. But just as much, the Japanese giant can only bluff. Whether with the whole idea or with some of its parts. We probably won’t know more this year, but they can surprise us for sure!