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From: Roger Merriman <roger@sarlet.com>
Newsgroups: rec.bicycles.tech
Subject: Re: "crash mode"
Date: 17 Apr 2025 08:05:29 GMT
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Catrike Ryder <Soloman@old.bikers.org> wrote:
> On Thu, 17 Apr 2025 09:49:39 +0700, John B. <slocombjb@gmail.com>
> wrote:
> 
>> On Wed, 16 Apr 2025 11:38:43 -0400, Frank Krygowski
>> <frkrygow@sbcglobal.net> wrote:
>> 
>>> On 4/16/2025 10:13 AM, Zen Cycle wrote:
>>>> 
>>>> Pro Fred Wright's (Bahrain Victorious) DI2 went into "crash mode" on its 
>>>> own during the Roubaix last sunday
>>>> 
>>>> https://www.cyclingnews.com/news/fred-wright-overcomes-shimano-di2- 
>>>> crash-mode-avoids-late-wrong-turn-to-grab-paris-roubaix-top-10/
>>>> 
>>>> " "My bike went into crash mode on Arenberg, which is probably the worst 
>>>> thing that could happen," he added, which is to say that his Shimano Di2 
>>>> electronic gearing basically mistook the harsh cobbles for a crash, 
>>>> locking him in gear."
>>> That's never, ever happened with my friction shifters!   ;-)
>> 
>> 
>> I suspect that Mr. Andrew has never had the problem with his "Fixi"
>> either :-)
> 
> Wait....  The shifter locks up? Maybe I'm naive, but I don't see any
> reason for having the shifter lock up because it thinks you crashed.
> 
> Maybe someone will enlighten me?
> 
> --
> C'est bon
> Soloman
> 

It’s so it doesn’t harm its self, I believe I guess like “safe mode” some
car engine will run in if they have a fault.

I guess with mechanical systems you’d be able to tell and not shift if
something was in the way, vs Electronics it could force something, which
could harm the rear mech.

Roger Merriman