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PostPosted: Tue Sep 26, 2017 5:45 am 
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Joined: Tue Aug 12, 2014 3:50 pm
Posts: 1128
Location: FIN
Noriced recently slight play on b-bolt. Red22 rd, around 2000km, short cage. Checked other rd's @home ( DA, Ultegra R800 )- there's not any kind of play there.

Question ; is it beggining of the end, or just such design ( spring-less for Red ) ?

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Posted: Tue Sep 26, 2017 5:45 am 


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PostPosted: Tue Sep 26, 2017 1:54 pm 
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Joined: Wed Aug 14, 2013 9:53 pm
Posts: 112
stormur wrote:
Noriced recently slight play on b-bolt. Red22 rd, around 2000km, short cage. Checked other rd's @home ( DA, Ultegra R800 )- there's not any kind of play there.

Question ; is it beggining of the end, or just such design ( spring-less for Red ) ?



SRAM road rear derailleurs are a different basic design than Shimanos. They do not have a spring in the b-knuckle. The tension is based completely off the chain tensioner.


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PostPosted: Tue Sep 26, 2017 7:33 pm 
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Joined: Sat May 26, 2012 11:26 pm
Posts: 1016
Not sure how the b bolt can develop play. It is just a bolt in a thread pushing aginst the hanger. The pivots of the parallelogram can develop play but i have not experienced this personally. I have personally had 3 sram rear derailleurs develop significant play on the axle of the pulley cage - 1 to failure (which killed a lightweight meilenstein), all had poor shifting across part of the cassette range as a symptom.

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PostPosted: Tue Sep 26, 2017 8:15 pm 
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Joined: Tue Aug 12, 2014 3:50 pm
Posts: 1128
Location: FIN
i don't mention non existant spring tension, rather play side-by-side. other rd's sit firm on hanger, Red has tiny play.

_________________
Go to Heaven for the climate, Hell for the company.
Mark Twain


I can be wrong, and have plenty of examples for that ;)


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PostPosted: Wed Sep 27, 2017 12:50 pm 
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Joined: Wed Aug 14, 2013 9:53 pm
Posts: 112
stormur wrote:
i don't mention non existant spring tension, rather play side-by-side. other rd's sit firm on hanger, Red has tiny play.


There should not be any side to side play from the hanger.


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Posted: Wed Sep 27, 2017 12:50 pm 


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PostPosted: Wed Sep 27, 2017 6:15 pm 
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Joined: Tue Aug 12, 2014 3:50 pm
Posts: 1128
Location: FIN
Sorry foe sarcasm, but just have to ; BLESSED THOSE WHO READ WITH UNDERSTANDING.

Quotting myself : "slight play on b-bolt " B-bolt, NOT hanger.


PS : problem solved, derailleur replaced /warranty.

_________________
Go to Heaven for the climate, Hell for the company.
Mark Twain


I can be wrong, and have plenty of examples for that ;)


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