'The big problem is water': UK ebike owners plagued by failing motors

Reliability problems and water ingress

• Many see water as a proximal cause; underlying issues are poor sealing, design, and weak warranties/consumer protection.
• Bosch mid-drives are heavily discussed: mounted low and angled to collect runoff, often directly behind the front wheel, with integrated electronics that are hard to service.
• Some shops report Bosch as the more reliable and better-supported option; others mention repeated failures and long factory-only repair cycles.
• Replacement motors are expensive (£550–700), and frames are often locked into one motor form factor, limiting alternatives.
• IP ratings come up: common systems are only “rain resistant” (roughly IPX54), not truly submersible. Fully sealed motors conflict with common air‑cooling designs.

UK vs Netherlands and environment

• Several commenters say these failures are much rarer in the Netherlands, attributing this to:
  • Different bikes (robust city/“Dutch” bikes vs e‑MTBs).
  • Full mudguards, chain cases, and weather-oriented design.
  • Better roads and drainage, fewer dirty puddles, and strong bike culture and maintenance habits.
• Others counter that Dutch bikes use many of the same Bosch systems and do fail, but warranties and consumer law handle it quietly.
• Some tie UK issues to broader decline in quality standards, infrastructure, and enforcement, though this is contested and partly subjective.

Drivetrain design and wear

• Mid-drives get praise for using the bike’s gears to keep a low‑power motor effective on hills, but they dramatically increase rear cassette and chain wear.
• Hub motors are seen as simpler, cheaper, and easier on the drivetrain, at the cost of less optimal torque at low speeds.
• Internally geared hubs and belt drives are admired for low maintenance and cleanliness but criticized for higher cost, weight, efficiency losses, and more complex repairs.

Weather, maintenance, and use patterns

• Wet, dirty conditions create abrasive grime that rapidly wears components, especially without full fenders and regular cleaning.
• Some riders happily hose and relube after rides; others avoid foul-weather riding due to cleanup effort and accelerated wear.
• Anecdotes span from many years of trouble‑free daily use (including in very wet climates) to bikes in the shop monthly, leading some to revert to non‑electric bikes.

Broader views on e‑bikes

• Ebikes are defended as practical transport (especially in hilly areas, for families, and for people with limited fitness), not just fitness tools.
• Skeptics dislike the added complexity, “rebooting” electronics, disposal of failed motors, and high prices relative to motorcycles.
• Some see media emphasis on e‑bike/EV problems as part of a broader narrative that downplays or distracts from ICE vehicle issues; others attribute it to new tech naturally being scrutinized.