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Comment by jeffbee | Hacker News Reader

I think it really pays to go with an e-bike from an actual bicycle company. The Trek TQ system for example is submersible (IP67) and has a 2-year warranty, same as Bosch.

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Is IP67 safe to wash like a car? Soapy sponge and reasonable hose pressure (not pressure washer) spray?

IP67 means "completely dust proof and submersible up to 1 meter". You can safely hose it down to clean it, pressure washers are probably a bit much.

There's actually bespoke pressure washer codes for the IP system, suffixing with a K

https://www.polycase.com/techtalk/waterproof-electronic-encl...

That said even ip66 is supposed to be resistant to 'jets' of water, like ~hose pressure.

Also, fwiw, I've never seen these used on prebuilt ebike components.

Is it safe to generalize like that? IP67 is a certification criteria that says that it must withstand conditions for certain amount of time during the test. But it doesn't say anything about doing it twice or how long you must wait between tries. For electronics it sometimes achieved by gel that can hold liquid for 30 min before water penetrates. It may eventually get dry again, but that is not covered by certification. Another point is that testing is done in distilled water, any impurities like oils can increase its penetrating ability and reduce the time. To me it looks like it's all down to actual manufacturer and item. IP rating is better than "splashproof" but still very vague.

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