Visit SHIMANO PRODUCT WEBSITE for the latest information. FDs are made for mounting on frame fixed braze on, or come with clamps for mounting on the seat tube. At face value, the distinction between compatible and incompatible parts should be an easy one to make, however there are a range of views.
These numbers are sourced from Shimano's technical documents. If FD and large chainring are mismatched for a couple of teeth, there’s no problems, it’s close enough. Shimano road bike derailleur compatibility All 11-speed Shimano road components are inter-compatible – you could for example use a Dura-Ace 9100 derailleur with a pair of 105 7000 shifters
Also, if the operation (movement) of the FD is limited to the two largest chainrings, it can work OK.In the picture above, the frame has cable routing so that FD cable comes from above. Frames usually have only one type of cable routing.Imagine in the picture above that the FD cage is shaped to match the middle chainring. ).Similar problems can occur if the mounting position isn’t correct – happens on some special, or custom built frames.Double FD will work with a triple chainring if the difference in teeth number between the smallest and the largest chainring is rather small (which defeats the purpose of a triple chainring though). Shimano rear derailleur compatibility This sortable chart contains a number of Shimano road rear derailleurs.
A newer standard, used on mountain bikes is the direct mount, it is explained at the end of this chapter.With double chainrings, this issue can be fixed with adjusting limit screws and it could be made to work. When mixing and matching components one of the important factors to take into account is what size cogs the derailleur can precisely shift over and also if the derailleur has the ability to take up all the slack created by the chain on the various combinations of front and rear sprockets. However, FD cage is a lot wider than the chain and triple FDs have just 3 positions, so depending on particular shifter – FD combination, even that can sometimes be made to work OK.Shimano road and MTB FDs have different cable pull ratio – that is the amount of FD movement for each mm of cable movement. That is why it is possible to mount a 10 speed FD and use it with a 6 to 8 speed chain.FD is curved in order to align with the curve of the largest front chainring. In some (rare) cases the clamp can be put above/below the frame mount, so it can stay, as long as it doesn’t interfere with FD movement and proper mounting relative to the front chainrings.So that would be a deciding factor for me. Experimentation has shown that some of these numbers can be exceeded in certain setups.
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