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Front Derailleur Chain Rubbing

Old 05-23-18, 04:39 PM
  #1  
Witterings
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Front Derailleur Chain Rubbing

If I'm in the middle gears it's fine but if I'm in either of the top or bottom couple of gears whilst it's not really bad I do get some chain rub on the front derailleur.

I've noticed when I've been cycling but today I cleaned and relubed the chain and as I was moving up / down through the gears turning the pedal with my hand felt this vibration / grinding coming back through the pedal.
Initially I thought the bearings in the bottom bracket must be going but as I moved up to the mid range it stopped and became really smooth but started again (although not nearly as badly) as I got towards the low gears
(I don't know what it is with me I always want to call gears on a bike the wrong way round, high gear is the smallest cog at the rear**********? )

I could understand it a lot easier if it was set too much one way or the other so only rubbed either in the low OR the high gears but not both ...

Is this normal or is it just a matter of adjusting them properly and if so I've seen some online videos on how to do it .... as a complete amateur if I follow them am I likely to get it right or make a complete hash of it and end up with a bike I can't ride and having to take it into the LBS for them to sort out ... I don't mind trying it myself but I don't want to make a complete mess of it making the bike unrideable as with the summer coming it'd probably be a while before the LBS could look at it .... in which case I'd rather just book it in and ride it as it is in the meantime as I spend most of the time in the mid range gears anyway.
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Old 05-23-18, 05:25 PM
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Iride01
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Assuming you are describing cross chaining... when in the big front and big rear or small front and small rear. Possibly the next smallest or biggest rear cog too.

Normal to a point. So it depends on how much. Some bike models do it less than others, some none at all. There are very small differences in the geometry, length of chainstays and various stuff that affect whether or not it can be eliminated completely.

New bike... probably not much you can do except let the place you bought it from do that free tuneup at the time they told you to bring it in. If it's an older bike, then adjustment might go a long way too. If you've replaced drivetrain components and wheels, then adjustments still a possibility or maybe the chainline changed due to that component not be designed for the same chainline spec. That can frequently be corrected too.

IMO, if you bike is correctly geared for your riding conditions, then you shouldn't be in those gears that make noise for very long periods of time. It's mostly just noise though some worry their 20 dollar chain and gears are going to wear out a few hundred miles too soon. I've not had that experience. Chains last me a long time and I don't worry about the noise mine makes.

Last edited by Iride01; 05-23-18 at 05:34 PM.
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Old 05-23-18, 05:59 PM
  #3  
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Originally Posted by Iride01 View Post
IMO, if you bike is correctly geared for your riding conditions, then you shouldn't be in those gears that make noise for very long periods of time.
I cut out most of the quote just to keep it shorter but to answer the quoted part it's pretty flat around here so I'm mid gear 85% of the time and it's not there then.

I hardly ever use the small cog on the front so it's permanently on the larger one but it's worst when it's then on the large at the front and small cog at the rear ... not so bad when it's on the large at the rear.
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Old 05-23-18, 07:01 PM
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Originally Posted by Witterings View Post
I cut out most of the quote just to keep it shorter but to answer the quoted part it's pretty flat around here so I'm mid gear 85% of the time and it's not there then.

I hardly ever use the small cog on the front so it's permanently on the larger one but it's worst when it's then on the large at the front and small cog at the rear ... not so bad when it's on the large at the rear.
sounds like you just need to trim the fd cage a tad. It shouldn't make contact in your smallest rear cog.
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