Replacing rear derailleur
09-23-18 | 01:17 PM
#2
Senior Member
Joined: Sep 2005
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From: Oakland, CA
Bikes: '82 Univega Competizione, '72 Motobecane Grand Record, '83 Mercian KOM Touring, '85 Univega Alpina Uno, '76 Eisentraut Limited
Take a look at Microshift 9-speed mountain derailleurs. Inexpensive and good quality, and can be found from many sources on eBay. They are compatible with Shimano pull ratios for indexing.
09-23-18 | 02:41 PM
#4
Nigel
Joined: Mar 2011
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From: San Jose, CA
Bikes: 1980s and 1990s steel: CyclePro, Nishiki, Schwinn, SR, Trek........
09-23-18 | 10:43 PM
#5
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Joined: Nov 2016
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From: SoCal
Bikes: 2014 Bruce Gordon Rock&Road, 1995 Santana Visa Tandem, 1990 Trek 520, 2012 Surly LHT
You can replace it with a new Shimano 9 speed MTB derailleur. Shimano changed the cable pull when they went designed the 10 speed MTB derailleurs (labeled as Dyna-Sys) so only a 9 speed (or earlier) will work with the shifters you are probably using (I assume indexed) . You can use either the
Shimano RD-M771 XT 9 speed Rear Derailleur - which has what I think of as a classic look
OR
They are about $60 to $70 new. Both have the traditional "top normal" return spring (i.e., the derailleur moves to a smaller cog when you loosen the cable tension). Make sure you get the correct length (GS medium cage or SGS long cage). If in doubt go with SGS.
Shimano RD-M771 XT 9 speed Rear Derailleur - which has what I think of as a classic look
OR
Shimano RD-M772 XT 9 Speed Rear Derailleur - which has the "Shadow" lower profile body with direct cable routing
They are about $60 to $70 new. Both have the traditional "top normal" return spring (i.e., the derailleur moves to a smaller cog when you loosen the cable tension). Make sure you get the correct length (GS medium cage or SGS long cage). If in doubt go with SGS.
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yellowlebron
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