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  1. #1
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    34T shifting problems?

    I've read snippets on various threads suggesting that people sometimes have shifting problems when running a 11-34 or 12-34 rear cassette. Indeed, one contributer appeared to suggest that some bike companies spec their tourers and MTBs with 11-32, rather than 11-34, rear cassettes because of these shifting problems.

    How prevalent are, and exactly what is the nature of, the shifting problems being alluded to? Is it difficult to get into the 34T gear, or is their a slippage problem once in the gear, or what?

  2. #2
    cyclopath vik's Avatar
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    I have 11-34 cassettes on 4 bikes and have never had any shifting problems in many years of use.
    safe riding - Vik
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  3. #3
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by vik
    I have 11-34 cassettes on 4 bikes and have never had any shifting problems in many years of use.
    I have 34s on everything and always have had. No issues really other then a tandem that gave me fits on everything anyway. The B screw is your friend.
    Stuart Black
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  4. #4
    Older I get, Better I was velonomad's Avatar
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    I had issues with the 12-34 alpine (12-28 to 34) on one of my bikes but that was because the 18 year-old Deore XT dérailleur finally got so sloppy it wouldn't push the chain over. New dérailleur fixed it.

  5. #5
    Easily distracted...
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    Quote Originally Posted by velonomad
    I had issues with the 12-34 alpine (12-28 to 34) on one of my bikes but that was because the 18 year-old Deore XT dérailleur finally got so sloppy it wouldn't push the chain over. New dérailleur fixed it.
    I would imagine that problems come from older derailers or road derailers not designed to accommodate that range of gears.
    Safe, efficient, and comfortable transportation.

  6. #6
    fks
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    Quote Originally Posted by vik
    I have 11-34 cassettes on 4 bikes and have never had any shifting problems in many years of use.

    +1

  7. #7
    Senior Member onbike 1939's Avatar
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    Quote Originally Posted by GTcommuter
    I would imagine that problems come from older derailers or road derailers not designed to accommodate that range of gears.
    +1
    I think that most of the problems arising with the 34t are solved by using a XT rear derr. which copes with the extra capacity needed.

  8. #8
    Patria O Muerte!
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    Quote Originally Posted by onbike 1939
    +1
    I think that most of the problems arising with the 34t are solved by using a XT rear derr. which copes with the extra capacity needed.

    Running a 12-34, non Shimano freewheel with no problems. Acera der. so don't think XT is a must.
    When people are free to do as they please, they usually imitate each other.

  9. #9
    Senior Member grolby's Avatar
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    Quote Originally Posted by onbike 1939
    +1
    I think that most of the problems arising with the 34t are solved by using a XT rear derr. which copes with the extra capacity needed.
    You don't need an XT. I honestly think that anything above Deore (what I've got for a rear derailer) is a waste of money for a tourist. I don't begrudge anyone picking out the higher spec ones, but the only real advantage of the nicer ones is weight, and not a lot of weight at that.

    I've never had a shifting problem with 34T cogs, by the way, even with my 20 year-old Light Action derailer. The chain actually seems to love shifting onto that huge cog, I've never had anything but nice, smooth shifts.
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  10. #10
    Senior Member teamcompi's Avatar
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    We go up to a 34 on a number of the bikes in the family and they all work just fine.

  11. #11
    Lentement mais sûrement Erick L's Avatar
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    I use a 12-32 with a 26-32 jump on a STX-RC derailer (1995, came with a 11-28). No problem.
    Erick - www.borealphoto.com/velo

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