Rocky Mountain Dyname & Bafang M-series reliability

Two unrelated stories sharing a page.

Rocky Mountain's Dyname: speed sensors (the number one component failure) and 3.0-era primary-drive wear are the recurring items on a serviceable, owner-liked layout, with a small, recent 4.0 bearing cluster worth watching.

Bafang: solid mechanicals, firmware roulette, and the real risk living in Europe's hostile warranty policy (83 reporters) rather than in the hardware. In both cases, buy the support channel as much as the motor.