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is chain supposed to slightly rubbing the front derailleur?

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is chain supposed to slightly rubbing the front derailleur?

Old 02-13-15, 09:11 PM
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is chain supposed to slightly rubbing the front derailleur?

i just bought 2014 trek madone 4.3 and i'm new to road bike.
the problem is chain keep slightly rubbing(not the entire chain) front derailleur. is this normal? or it shouldn't be rubbing?
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Old 02-13-15, 09:23 PM
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It shouldn't rub! Find out which derailleur you have and search for a tuning adjustment guide for it. (A general guide would work, but it'd be nice to have a video show you where everything is!)
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Old 02-13-15, 09:38 PM
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It should not rub in most front/rear gear combinations, but if it is rubbing when you are big ring front, big rear or small ring front, small rear then that is normal to rub and you should not use those gears anyways (cross chaining). If it is a new bike, the shop should fix it. Not hard to do yourself if you have some experience working on bikes.
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Old 02-13-15, 10:01 PM
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Are you using the trim on your shifters?
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Old 02-13-15, 10:06 PM
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I set my FD limits to position the cage < 1mm from the outside of the chain on the big ring/small cog and < 1mm from the inside of the chain on the small ring/big cog.

Aside from assuring very snappy shifts and eliminating chain drop, this setup produces rubbing when in the 2 most extreme cross-chain combinations; which serves nicely as an audible reminder that I'm doing it wrong.

Last edited by velociraptor; 02-13-15 at 10:09 PM.
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Old 02-13-15, 10:08 PM
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In a perfect world it wouldn't rub. In the real world there are some combinations of FD, cassettes, chains etc that will rub in certain gear combinations no matter how well tuned. This article is a good start to make sure it's as good as it can be

Park Tool Co. » ParkTool Blog » Front Derailleur Adjustments
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Old 02-13-15, 10:10 PM
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Take it to the LBS and let them adjust it for you. It should be free if it is new. If it is not new and you are at all mechanically inclined there are many videos on how to adjust and use trim to keep the chain from rubbing. Don't mess with the limit screws until you fully understand how they work and their purpose.
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Old 02-13-15, 10:21 PM
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Originally Posted by spdracr39
Take it to the LBS and let them adjust it for you. It should be free if it is new. If it is not new and you are at all mechanically inclined there are many videos on how to adjust and use trim to keep the chain from rubbing. Don't mess with the limit screws until you fully understand how they work and their purpose.
+1

It can be tricky to get a front derailleur adjusted perfectly if it isn't in the exactly proper spot.
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Old 02-13-15, 11:28 PM
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I don't think it should, I also don't think cross chaining is bad also. I can run big ring and biggest gear in the back to problem. Also does not rub in the big ring and smallest in the back.
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Old 02-14-15, 12:28 AM
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Originally Posted by spdracr39
Take it to the LBS and let them adjust it for you. It should be free if it is new. If it is not new and you are at all mechanically inclined there are many videos on how to adjust and use trim to keep the chain from rubbing. Don't mess with the limit screws until you fully understand how they work and their purpose.
+2

Sounds like it either wasn't dialed in properly or you've ridden it enough that your cables have begun to stretch and you just need a slight re-adjustment. As you break in your bike, a few things here or there will need some attention. Think of it like tuning a guitar.
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