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From: Rolf Mantel <news@hartig-mantel.de>
Newsgroups: rec.bicycles.tech
Subject: Re: Garmin Edge 830 elevation issues
Date: Fri, 2 Aug 2024 11:34:05 +0200
Organization: A noiseless patient Spider
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Am 02.08.2024 um 04:39 schrieb Frank Krygowski:
> On 8/1/2024 6:54 PM, Jeff Liebermann wrote:
>> > It's possible to "pump" water into an allegedly waterproof enclosure.
>> Heat the GPS with hot air to about 45C.  Then dump it in a bucket of
>> 10C cold water.  The air inside the GPS will contract and create a
>> partial vacuum, which then sucks the water into the enclosure (if
>> there are any leaks). 
> 
> It's a bit interesting that the same problem can apparently happen with 
> hub dynamos. Supposedly, the SON hub dynamos (from Germany) have a 
> pressure compensation gizmo built into them to prevent that mechanism 
> from rusting the insides of the hub.

 From the mechanism, it can happen with any bicycle hub: park the bike 
inside (20C) in winter, use the bike in the wet around 0C.
It's just that SON is IIRC the only hub expensive enough to have 
detected and offered a fix to this problem.

Rolf