ZoMbIeCuStOmS

ok so let me start by saying thanks for having me and thanks in advance for your help. My bike is a 2007 Jamis crosscountry and I am having problems with the front deraileur the chain rubs and sometimes the bike wont shift. I took it to my local bike shop and had a tune up. The mechanic at the shop said that the front deraileur wasnt factory to the bike and thats why I was having so much trouble with it but he was able to get it pretty close to right and rideable. He was wrong the bike is just as bad as ever maybe worse the chain rubs in almost every gear and like I said occasionally simply refuses to jump to the largest ring upfront. The front deraileur is a shimano deore so I am sure that it is not factory but isnt that the point of getting high end components for your bike to improve it not to have nothing but problems. Is it all in the adjustments that he didnt get right or should i just get a different derailleur. thanks for any advice

CACycling

Higher end components may help but they need to be the right high end components for your application. Pics would be helpful but you need to at least let us know what you have. How many chain rings, exactly which Deore FD, type of shifters, etc. for us to help.

fietsbob

Shimano's Index shifting has big ka-thunk shifts, 2 or 3,
and depends on cage shape , after that.
so cross chain mis-operation, will drag every time.

in low stick to the big cogs, middle don't bother with the 2 outside edge cogs
and in high, big ring, stay away from the last few big cassette cogs.

Do the math.. you will find ratio redundancies
in those overlap zones, anyhow.

jimc101

as CACycling metioned, there are multiple version of FD's, currently there are 8 different version of the Deore FR avaliable, with different speeds, and fittings for these, if you have replaced you FD with an version which isn't designed for your frame design / gearing, you can have issues with shifting not being great.

FD's unless they fail are one of the few areas on a bike which upgrading them doesn't make much differences. Deore being a mid range item won't be significantly better than the SR XCN/XCR fitted as standard, if you have fitted anything other than a top swing FD this could be what is causing you the issues, you haven't given the specifics for this.

You have made no mention on the condition / routing of the cables, this can make a difference to shifting, or which model of the Cross Country you have.