chain rubbing front derailleur hanger

garethjones

hi,

Probably this has been posted a thousands time before, but I am really stuck. My chain rubs my front derailleur hanger when the chain is in the two smallest cogs at the back. I have tried the limit screws, and front mech is 2mm above the largest chain ring and is parallel. What else can I do?

thanks,
G

drlodge

Which chainring are you in when this rubbing occurs - large or small?

garethjones

it happens in all of them

drlodge

So you have a triple chainring then...? Sounds like the hanger is in the wrong place all the time so you need to start from scratch and with the basics.

Did someone mention park tool? http://www.parktool.com/blog/repair-hel ... djustments ;-)

One thing to check: with the chain in the smallest chainring and largest sprocket (so the chain is as close to the frame as possible) the FD hanger should just be clear of the inside of the chain, and the cable should be just taught.

garethjones

yes, it is triple. Back to the start I go!

drlodge

You could always try unscrewing the barrel adjuster, which will pull the FD outwards. Then you can see where the sweet spot is between the outside of the cage rubbing, and the inside. With a triple, you might always get some rubbing so the trick is to adjust so there is minimal rub on the gears you least often use (typically the lowest and highest gears).

mrs nesbitt

Try carefully adjusting the 'low' limit screw again