SomniumCycle

I purchased a used Specialized Allez a few days back, the front derailleur was defective, the portion of the derailleur the holds the spring had worn down. I have been riding another Allez for 4 years now, but this year I found a crack it the frame so I went shopping for a replacement. My plan was to use the derailleur from my old bike on the new one.
(That's the back story.)

I got the new bike home stripped it down, swapped the cranks, cleaned all the bolts, applied new grease... all the good stuff, including the derailleur. Then I went to take it for a spin, the back shifts like a charm, the front... not so much.

I adjusted the derailleur several times, and can get it to shift perfectly on a stand but once I get on it there are issues. Usually the problem is the is won't shift onto the largest ring, but when I can tweak it just right it will shift from 1 to 2 to 3 but it won't shift from 2 to 1. (1 being the smallest)

Needless to say it's frustrating, any idea on a fix? If taking it to the LBS is my only option I'll do it, but I would much rather learn myself.

PS, i searched, there are so many threads on derailleurs that I found it difficult to find a similar problem.

LarDasse74

If the derailleur is compatible (shimano? Road-specific? Previously functioned well with road-type indexed shifters, it should work.

Go to https://www.parktool.com/repair/readhowto.asp?id=75 and follow the instructions closely from the start.

SomniumCycle

Ha ha, sorry, I just opened this up to edit my thread.

I wanted to include the information on the derailleur itself. Both bikes had identical set ups. Road bikes, Shimano Tiagra shifters and derailleurs.

I will start over using this how to, thanks!