I don't know about wear but on the SunRace site (for example)
a 9 speed 11-36 is 436gm
a 10 speed 11-42 is 494gm
a 12 speed 11-50 is 586gm
so it seems 150gram's or 5 ounces to go from 9:11-36 to 12:11-50.
I can only assume Shimano, while maybe not having the same numbers, would have a similar equivalence in variation.
But I would not argue one or the other systems based on weight difference. As noted, that's a bit of a red herring.To me it's more about how it meshes with the KISS principle. What is the simplest form I need to accomplish the task successfully. Off road that now seems to be (personally) 1x. It's also why I look to mechanical disc but don't feel I need hydraulic. Some would argue Hydro is better (true) but I don't need it and can work on the simpler form of mechanical in the field easier.
Last edited by Happy Feet; 12-07-19 at 05:11 PM.