Left sided shifter for Tiagra double and triple the same or different?
I get different answers at the above questions. Are there different double and triple left sided shifter (for Tiagra), or is the same shifter compatible for either or ( I know higher end Shimano shifters have differnt types - this question is about Tiagra specific)
I had a Tiagra left shifter replaced on a double set-up. I believe the first shifter was triple-compatible. The one they replaced it with clearly says 'Double' on the gear pod indicator; the first one did not. So: I still can't answer your question, since I don't know if the internals are any different, but would also like to know the answer.
Originally there was just 4500, which was marketed as double and triple compatible.
Then, 4501 (double only) and 4503 (same as 4500, but marketed as triple) replaced 4500. I believe this is because some people were breaking their shifter when they used the 4500 on a double setup when using the first two shift positions (inner and middle). Attempting to push the shifter into the outer position, which is locked out by the high limit screw, has the potential to stress and break the internal mechanism. Some people will set up the shifter so that the middle and outer positions are used, but this might mess up trimming.
In short, the 4501 can only be used for double. 4500 and 4503 are effectively the same and can be used for double or triple, but be careful if using a double.
Originally Posted by slopvehicle
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