Hello,
I have bought a second-hand road bike in early june, tarmac SL4 with shimano 105 5700 groupset, with a triple 50-39-30 crankset. FD is compatible with this.
Since I have it the FD isn't working properly, 3 different bike shop took a look at it, but none managed to index the FD, I tried aswell with no success. 4 people that know about roadbikes failing to index a FD.. there is a weird thing going on.
The main problem is downshifting from the big ring to the middle ring, I have 2 choices : either I can downshift easily but 50-11/13/15 are rubbing, or nothing is rubbing but I have to be high in the cassette to downshift / I have to downshift to the little ring and then upshift onto the middle ring (clearly this kills the momentum I have at the bottom of a climb).
I have now ridden 5 500km (3 500ish miles), but I just can't stand it anymore.
I was thinking about changing the big ring, middle ring, cassette, chain and FD.
I would like to get a 53T ring but I don't think any FD can have enough capacity to do 53T to 30T, and going 53-39 is not possible since I love doing hard climbs (39 is too much for me in those climbs) and changing the lever is expensive.
Do you guys have any ideas on what can I do ? (about fixing the current set up or thinking about a new set up)
Here are some photos of the FD when the chain is on the middle or big ring (I know it's dirty but when everything was clean it wasn't working either, now I live in a small flat it's hard to find a place to clean the bike and use chemicals)
https://ibb.co/vv5mDcq
https://ibb.co/hZNxGGV
https://ibb.co/jzf2Lnq
https://ibb.co/Y2NrkzX
Thank you for your time, I really appriciate it.