Originally Posted by
IK_biker
You are looking at this the wrong way. A FD is not the solution. However, there are plenty of people who deeply believe that throwing money at an issue would solve it (new FD), and you may be one of them...
With your gearing you have no business using the large chainring with the 2 largest cogs, nor using the granny with the 2 smallest cogs. Such cross-chaining results in mechanical losses and premature wear.
Even with a larger chainring differential you still won't need to use the cross-chaining combinations. It may be your habit to use these, but it is unnecessary as you have a very similar gear ratio by using the other c/ring.
On one of my bikes I have been riding a 46/28 (and lately a 46/26) double with a 11-36 10-speed cassette for many thousands of miles. Shimano 105 SIS shifters, CX70 in the front and a XT RD. A good adjustment of the FD makes it possible that trimming is necessary only when using the granny with the 3rd smallest cog, and the large c/ring - with the 2nd largest cog (which in my case is absolutely necessary with the 46/26 in front). All other gears are noiseless without trimming.
Your comment that the trimming now only works in the large ring and is "devil to set up" tells me that your adjustments are amiss. On the other hand, I have a considerable experience with such adjustments, having wrenched on bikes for some 49 years...
So, there you have it: either re-learn how to shift and what combos to use, or learn to live with the noise. Replacing the FD won't solve your problem.
Thanks, but I disagree with you. I agree that you should not try to use big/biggest or small/smallest but not so much that 3 sprockets are excluded from use on either rings.
Furthermore, when I bought the bike from a very reputable dealer, they explained that the trim function worked only on the large ring. Now I think they may have been wrong with that but it does at least prove that they too had problems setting up the trim finction on the bike. I can achive trim on both rings, but the movement is so slight as to make it ineffective on both rings. Therefore, I opt to set it adequately on one and not the other.
And I do know how to shift using various permutations.
Thanks for the response.