I am thinking of putting XT M-8050 11 speed Di2 on my ebike Levo . Is there any reasons that it is not a good idea? Currently i'm using XT M-8100 12 speed.
Why not go for the AXS upgrade kit and keep your twelve speed set up? I had Di2 on my merida and loved it but AXS can be had for decent money and works with the shimano 12 speed cassette.