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Thinking of 1x9-ing my perennial 'project' frame (it started life in 1995 as my first MTB, since then it's been a bodged SS, a commuter, a SS commuter, and is currently a flat pedalled, weirdy handlebarred pub bike)
I have an old 105 mech in the bits box from it's commuter days, will that work with an 11-34 cassette?
maybe is the only correct answer. it has a lot to do with the geometry of the mech hanger.
Officially the 'old' road mechs (pre-5700) are only rated to 27t. The newer ones are 28t.
You 'may' get more teeth with a long hanger and/or short chain but you'd be lucky.
Had a tiagra running on a 11-32,
Got dura ace running on 11-28 currently, on a 1x9 setup with a 34 upfront shifted by xtr, works fine.
I'd say probably not though, 34 is a big cog for a titchy roadie mech.
Or buy a 9 speed Acera. I bought one for a 1x9 bike for my wife. Same weight as a Deore. Works fine. Cheap as chips at £12.75 plus postage.
http://www.rosebikes.co.uk/article/shimano-acera-rear-derailleur-rd-m390-sgs/aid:516112
I was happy enough I've ordered another just to have as a spare. I weighed mine at 278g In the same ballpark as a Deore I think. 40g more than an XT.
Officially the 'old' road mechs (pre-5700) are only rated to 27t.
mainly because they only make roadie cassettes up to 27t.
mainly because they only make roadie cassettes up to 27t.
Old stuff only goes up to 27T (so I wouldn't recommend anything larger than 27/28T cog with an old roadie rear mech), new roadie stuff goes up to 32T these days... At least on SRAM Apex and Tiagra it does anyway... Higher end kit maybe not so.