I have a few eMTBs; two were specced with 11-speed drivetrains and two with 10-speeds. I've put a couple thousand fairly hard trail miles on them thus far, and have noticed a trend: 11-speed chains wear out faster! I suppose this is logical given that they have to be be thinnner than 10-speed chains, but given the heavy torque provided by mid-drives, why are so many higher-end eMTBs still equipped with 11-speed components? I recently read Park Tool's "When to Replace a Worn Chain," which says "If you are using a chain designed for ten or fewer gears, replace your chain as it nears the 0.75 percent mark. If you are using an eleven or twelve speed chain, replace your chain once it has reached 0.5 percent wear. For two-sprocket or single speed bikes, replace your chain as it reaches the 1 percent wear mark." Using this guideline, I find myself replacing 11-sp chains every 200 miles! Clearly we still need well-spread gears for steep climbs and fast flat runs on eMTBs, but SRAM's new 8-speed EX1 groupset covers an 11-48t range, eliminating some of the unnecessary (IMO) in-between gears provided by 11-speed cassettes. I predict that all the major drivetrain manufacturers will follow suit, hopefully sooner than later... When it comes time and my cassettes wear out, I plan to use this more sensible setup. My 2014 Haibike FS RX might be the exception. Its 10-speed drivetrain only ranges from 11-36t, and I suspect the Bosch motor was tuned to work best within that ratio. Jumping to a 48t cog might wreak havoc - has anyone tried?