Originally Posted by
fooferdoggie
I have a Gen 2 speed and I have 10,000 miles on the cassette and chainring. 5 chains though from 2000 to 3000 miles on each chain.
Yeah it depends a lot on riding conditions and style, plus the Gen 2 motor uses a 1:1 drive which is way easier on drivetrains, vs. the Gen 3 which has a 2.5:1 step-up gear, so it's spinning a tiny pinion (I run 17T and 20T on my two G3s).
My conditions are close to worst-case, though; extremely steep roads and trails in a rainy area that frequently salts the roads, carrying heavy loads (often over 100 kg) on a big cargo bike, plus I'm close to 100 kg myself and I ride hard at max boost on the strongest motor Bosch makes. So putting that kind of tension through a drivetrain when there's constant salt and grit present really shortens component life. If I was riding an unloaded bike in a flat dry area, I'm sure I'd see 5-10X the drivetrain life.