Road Derailleur with trigger shifters.

Discussion in 'Bicycle Mechanics and Repairs' started by Salty seadog, 10 Aug 2018.

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  1. Salty seadog

    Salty seadog Space Cadet...(3rd Class...)

    I need to replace my sram derailleur on the Montpellier. It has flat bar therefore trigger shifters. I have looked at the sram apex derailleur but this is a road mech. Both it and the mech it is replacing use sram exact actuation which gives a 1:1 pull ratio.

    Is it likely to work here or will I need a mtb specific mech?.

    TIA.
     
  2. Nick Saddlesore

    Nick Saddlesore Well-Known Member

    Location:
    London
    AFAIK, there is exact actuation and also X-actuation. If mech and shifters are the same they should work, but you can't mix. Mechs come in medium and long cage, so you need to check capacity for your cassette - or just get long cage.
    https://www.sram.com/sram/mountain/technologies/exact-actuation
     
  3. OP
    OP
    Salty seadog

    Salty seadog Space Cadet...(3rd Class...)

    Yep definitly exact actuation on the new and old mech. Just that the mech is classes as a road mech and I have trigger shifters.
     
  4. Nick Saddlesore

    Nick Saddlesore Well-Known Member

    Location:
    London
    Or just go fixed...
     
    dave r likes this.
  5. OP
    OP
    Salty seadog

    Salty seadog Space Cadet...(3rd Class...)

    Haha I've got one in the fleet but it's on the freewheel, not flipped it yet..
     
  6. OP
    OP
    Salty seadog

    Salty seadog Space Cadet...(3rd Class...)

    Just a little bump for the day watch.
     
  7. Jenkins

    Jenkins Veteran

    Location:
    Felixstowe
    This is prompted by a previous query where I thought @Salty seadog would need a X5 rear derailleur and nor an Apex one for the flat bar due to what was referred to as different cable pulls from my previous research when looking to replace a SRAM derailleur myself in the past.

    I can only guess that this means that the trigger shifters on flat bar/MTB move a different amount of cable when operated than the road shifters and the derailleurs are set up to account for the different amount of cable moved - could anybody help both Salty & myself by clarifying this.
     
    Last edited: 11 Aug 2018
    Salty seadog likes this.
  8. OP
    OP
    Salty seadog

    Salty seadog Space Cadet...(3rd Class...)

    Asked in my lbs this morning and they were not sure it would work. I guess the difference is the differing length of cable pull (as noted by Jenkins) are compensated for by the difference in the pivoting of the parallelogram of the derailleur, after all, they both have to get the chain up the same cassette.

    Jenkins, fancy a bowl of chips and a couple of Guinness until our curiosity is sated?
     
    Jenkins likes this.
  9. Jenkins

    Jenkins Veteran

    Location:
    Felixstowe
    Could I exchange a the Guinness for a Becks instead? Salt, vinegar & ketchup with the chips?
     
  10. OP
    OP
    Salty seadog

    Salty seadog Space Cadet...(3rd Class...)

    Well It's your round so away on.:cheers:
     
    Last edited: 11 Aug 2018
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