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  1. #1
    Senior Member darkroast's Avatar
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    Road levers and MTB RD/cassette question

    My drivetrain is in need of some TLC (read part replacement) and I was wondering if it would be possible to swap out my existing rear system which consists of a Shimano 105 RD and cassette (12-25) with a MTB rear (say Shimano Deore w/12-34 cassette - 9 speed). For levers I have 105 integrated 10 speed brake/shifter system. The bike is the 07 Kona JtS. I want to keep the front as a double 46x36. Brief discussion with people indicate the challenge (possible show stopper) will be the compatibility between the brifters and new RD/cassette.

    Appreciate any advice.

    Hanif.
    '09 SURLY LHT - beast of burden/commuter/tourer
    '09 MASI Speciale Commuter FG - commuter
    '08 Steelwool Pure Laine - the LD bike
    '07 Kona JtS

  2. #2
    Senior Member Bill Kapaun's Avatar
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    10 speed shifter would need something like a JTEK Shiftmate to work with a 9 speed cassette, since the spacing is different.
    Deore RDER would be fine, plus a longer chain.
    Last edited by Bill Kapaun; 08-19-08 at 05:35 PM.

  3. #3
    Senior Member Retro Grouch's Avatar
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    You'll definitely need a mountain bike rear derailleur to handle the 34t big cog.

    A 10-speed shifter won't work with a 9-speed cassette without some modification. If ShiftMate makes the gizmo that you need, that would be the cost effective solution. Another option would be to contact Santana Cycles about a 10-speed cassette with a 34 big cog.

  4. #4
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by Retro Grouch View Post
    Another option would be to contact Santana Cycles about a 10-speed cassette with a 34 big cog.

    Why Santana? IRD makes a couple:
    http://www.interlocracing.com/cassbreakdown.html
    Jeff Wills

    All my bikes.

  5. #5
    Senior Member darkroast's Avatar
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    Thanks to all for the advice. I might try the Shiftmate solution first as at present it is the most cost effective. Thanks again.
    '09 SURLY LHT - beast of burden/commuter/tourer
    '09 MASI Speciale Commuter FG - commuter
    '08 Steelwool Pure Laine - the LD bike
    '07 Kona JtS

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