Hi I'm having a bit of an issue with the braise on mount on my bike I got second hand. The image shows the front derailleur in the lowest possible position on the mount but I'm having issues where in the highest gear combination it's sometimes dropping chains on bumpy roads. I suspect this is because it needs to be a tad lower but I seek to have maxed out the adjustment.
Furthermore, I can't get the derailleur perfectly aligned as even with the screw wound out the guide for the shifter cable contacts the mount.
Any ideas what I can do?
by BenP717
5 Comments
Braze-on. Unless you’re cooking it. You could file down the opening a bit to get some more space, or switch to big boy gears and never look back
You can use a small rat-tail file to take some material off the bottom of the adjustment slot. That’s about your only reasonable option here.
I had to do this on my wife’s bike, because we went to smaller chainrings than stock, along with shorter cranks.
That looks low enough to me! Look up the instructions on Shimano’s website—I’ll bet it says 2-3mm clearance, and it looks like you’ve got that.
As to the cabling, I can’t really tell from the pictures what’s going on, but I think you’ve got it wired incorrectly. But the online instructions will show you the correct way.
If I’m reading correctly what you’re describing is Cross chaining, using the Big-Big combo, and you would drop the chain that way regardless of having the FD lower, it can even happen with 1×12 MTB gears. If you lower the FD further you risk the possibility of not clearing the big chainring which is a bigger issue than dropping the chain from running a big-big combo.
How bumpy are we talking here? Because road gears are not designed to be taken on too rough surfaces