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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: Misplacing components
Date: Wed, 24 Apr 2024 10:02:35 -0500
Organization: Yellow Jersey, Ltd.
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On 4/24/2024 9:33 AM, Zen Cycle wrote:
> On 4/24/2024 10:19 AM, Roger Merriman wrote:
>> AMuzi <am@yellowjersey.org> wrote:
>>> On 4/24/2024 4:29 AM, Roger Merriman wrote:
>>>> Frank Krygowski <frkrygow@sbcglobal.net> wrote:
>>>>> On 4/23/2024 7:36 PM, Roger Merriman wrote:
>>>>>> Frank Krygowski <frkrygow@sbcglobal.net> wrote:
>>>>>>> ... I'm pretty sure I still have the Huret Svelto 
>>>>>>> derailleur that was
>>>>>>> original equipment on my first ever ten speed - back 
>>>>>>> when "ten speed"
>>>>>>> meant 5x2.
>>>>>>>
>>>>>> My first road bike was that as well it was old at that 
>>>>>> point, Suntour in
>>>>>> this case, I did upgrade it to modern 10s mainly it 
>>>>>> was massively over
>>>>>> geared particularly for someone who rides around Wales 
>>>>>> from time to time!
>>>>>>
>>>>>> But old derailleurs seem to last, seem to remember the 
>>>>>> shifting was about
>>>>>> the same both systems using down tube shifters, though 
>>>>>> rear was indexed for
>>>>>> the modern one, but front was left friction.
>>>>>
>>>>> I rode with that Svelto for a few years. One of my 
>>>>> first little bike
>>>>> splurges (when we had very little extra money) was to 
>>>>> change to SunTour
>>>>> rear derailleurs. The difference in shifting was 
>>>>> enormous. And the
>>>>> SunTours also allowed bigger rear cogs, especially 
>>>>> helpful for my wife.
>>>>>
>>>>> I suspect the Svelto would now shift as well as it ever 
>>>>> did. I do think
>>>>> old derailleurs last a long time.
>>>>>
>>>> If the spring has got tired maybe be a bit slower, I did 
>>>> have one that for
>>>> that reason ie it shifted but really quite slowly, that 
>>>> I replaced it with
>>>> a new derailleur 9s being so cheap.
>>>>
>>>> But yes they seem to last and for road bikes not much 
>>>> technology
>>>> advancement over last few decades, different to 
>>>> MTB/Gravel which have
>>>> clutches and what not.
>>>>
>>>> Roger Merriman
>>>>
>>>
>>> In theory, calculating spring degradation over cycles is
>>> extremely complex but in practice, within a human lifetime,
>>> derailleur springs do not noticeably degrade*.
>>>
>>> Pivots can become encrusted, rusty, worn, bent and broken
>>> such that the spring can no longer move them as smartly but
>>> that's not a change in the spring itself.
>>>
>>> *else my vintage automatic Swiss watches would have died
>>> long ago after many millions of cycles. The 1960 Rado on my
>>> wrist today keeps perfect time.
>>
>> The rear mech 9s Deore on the old MTB did become slow, was 
>> perfectly in
>> tune etc just slow to respond it had though done 10 years 
>> climbing the
>> Welsh hills and what not before retirement to plodding 
>> across West London.
>>
>> Certainly a new mech even of a lower grade seemed to bring 
>> the shifting
>> back to normal.
>>
>> Roger Merriman
>>
> 
> I'm thinking that isn't the spring as much as it is the pivots

Exactly. Springs do not 'wear out' or 'go soft' when used 
within designed load/range limits to any measurable degree.
-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971