View attachment 149720
So there’s been a lot of talk about weight when it comes to the Saturn. While most have blamed the MGU and battery itself, and perhaps to lesser extent the aluminum frame vs. some theoretical carbon alternative, I am surprised to find out a potential minor suspect is the the spring belt tensioner itself. It comes in a 503 grams (even sans the
adapter mentioned earlier), more than the weight of GX T-Type derailleur with battery, albeit at a sprung weight. Admittedly the tensioner is very well made and has an excellent design, with CNC alloy housing and mounts. And while it does have a metal spring inside, I think the tension arm itself is cast iron instead of forged/cast aluminum - it seems too heavy to be otherwise. It’s a substantial component, and for now is the price you have to pay for dual suspension belt drive capability.
Of course, Nicolai could have gone the Rotwild route with a chained MGU bike with a potentially lighter tensioner that starts to look like derailleur all over again, but frankly the appeal of a belt-driven MTB - informed by and my own experience with dual suspension belt drive transmissions - is too good to choose otherwise.