Depends on what groupset the bike has already. If it's original it should be (I believe) all Shimano. You can swap the rear derailleur for something with a longer cage and not have a shifting issue. So let's say it's Shimano 105, 5500 series because that's just what I'm picturing. You can get that rear derailleur in a long cage version to handle bigger cogs and the shifter pull is all the same.