I purchased a 2021 Trek Powerfly 4 from local Trek dealer in Canada (Port Coquitlam, BC). The rear hub bearings were no good from the start, and the Trek dealer agreed to warranty them. That was two months ago. I understand my Trek dealer is busy, but their communication with me has been...
If you google for kiox retrofit it will come up. My local shop billed me 1.5hrs plus the cost of the kit. You could do it yourself, but I believe you have to drop the motor.
Reviving an old topic here. I just had the rear hub bearings fail on my 2021 Powerfly 4, after four months. I took it back to the Trek shop where I bought it, and the mechanic tried to say "Oh, it's fine - it is supposed to be like that". After pulling a wheel off a brand new Powerfly and...