Derallieur options for use with bar end shifters

Ber Nard
Ber Nard Posts: 827
edited August 2013 in Workshop
I'm toying with the idea of gearing down my touring bike and I'd like to go for an 11-32 cassette. Current set-up is a 105 5701 medium cage rear mech, 12-28 cassette and 10sp Dura Ace bar end shifters. Chainset is 26-36-46.

Will I need to change the rear mech to cope with a 32t sprocket? I believe the 105 mech has a recommended max size of 30t.

If I would need a new derailleur, are there any MTB 10sp models that would be compatible with my shifters?

Cheers.

Rob

Comments

  • halfround
    halfround Posts: 44
    You might get a 32 to work, but it could require a longer b screw or turning the screw around. Any shimano mtb mech 10 speed will work.
  • mercia_man
    mercia_man Posts: 1,431
    Easiest would be to fit 24 inner chain wheel. You would get noticeably lower bottom gear than at present and no need to get a new cassette, change your mech or to lengthen chain. A mid cage mech would cope.
  • mattv
    mattv Posts: 992
    10speed dyna sys mtb mechs ARE NOT COMPATIBLE with 10speed road mechs. They pull different amounts of cable. One way round the original problem is to put a longer b-tension screw in the road mech. Not ideal or perfect, but I have done it on 2 different bikes when I had no other choice. This allows the 105 mech to take a 32 or 34t cassette.
  • halfround
    halfround Posts: 44
    Sorry wrong advice from me, 10 sp mountain bike is different from other shimano. Used to be all the same you live and learn !
  • Ber Nard
    Ber Nard Posts: 827
    Cheers all.

    Swapping out the small chainring is the easy option but the cassette will need replacing soon so I thought I'd kill two birds with one stone.

    Looks like bodging the rear mech may be an option, lots of bits of the bike are bodged already anyway!

    Rob
  • andy_wrx
    andy_wrx Posts: 3,396
    A 9sp MTB rear mech will work fine (or 8 or 7)
    - it's just 10sp MTB which is incompatible
  • hstiles
    hstiles Posts: 414
    On the latest 105, the SS (short cage) supports a maximum 30T on a double, 28 on a triple. Medium cage (GS) supports up to 32 on a triple.

    That means some pretty big jumps between ratios on the rear, so I'd be more tempted to opt for a smaller small chainring up front for more even changes.

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