shimano 9 speed road/mtb compatability

Oldnslo Posts: 6
edited December 2013 in Workshop
I'm currently running 9 speed tiagra/sora on my winter trainer/commuter bike.I'm planning a tour in France for next year and was wondering if I could run a 9 speed shimano mtb mech (m592) with my shifters which would allow me to gear down to 26in(11-36 cassette).


  • nicklouse
    nicklouse Posts: 50,675
    9spd is interchangeable.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • andrew_s
    andrew_s Posts: 2,511
    The m952 is OK, but if you get a different rear mech, watch out for "low normal" versions that will shift the wrong way.
    Note also that Road/MTB front derailleurs aren't interchangeable.
  • maddog 2
    maddog 2 Posts: 8,114
    don't use a 10spd mech, as the pull ratio is different.

    9spd is only officially capable of 34t but there's a fairly even chance that you'll be okay with 36t, with a tweak of the tension screw.
    Facts are meaningless, you can use facts to prove anything that's remotely true! - Homer
  • Thanks for the replies. I'm running a compact chainset and can't justify expense of triple chainset/new shifters so I'm leaving the front alone. Tour will be BnBing so not carrying loads of gear,I should be o.k.
  • andy_wrx
    andy_wrx Posts: 3,396
    maddog 2 wrote:
    don't use a 10spd mech, as the pull ratio is different.

    This means MTB 10sp mech - 8/9/10sp road mechs are interchangeable