ebike28/50 on a 27.5 is about the same as a 22/37 on a 26in. We have a 5.6k ft mtn near me. It takes about an hour and a half of solid climbing just to make it up to the ridge. From there it's STEEP fire road climbing. After 3hrs of solid climbing with just a few tiny downhill fireroad breaks, I would absolutely need a 28/50.
the only way