Chain rub



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Paul

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Well here I go again with, what I guess is, another basic question but people here are great at
helping out a beginner.

I've always had a spot of chain rub when riding the middle chainring with the chain on the smallest
(8th) sprocket. I realise that this in one of those 'out of bounds' gears and it rarely gets used so
I've never worried about it.

I've recently noticed a spot of light chain rub however when riding with the chain on the 2nd from
smallest sprocket (7th). This only occurs when pedalling really hard (more of a mash really), the
sort of pedalling force that would probably suggest to a more experienced cyclist that they need to
change gear :).

I appreciate that both the frame and chain can flex when pedalling (although I have an oversized
aluminium alloy frame - I don't know whether these flex or not) but I was wondering whether chain
rub is anything to worry about, does it suggest a mal-adjusted derailleur? The chainrings shift
crisply so I don't want to meddle with an otherwise working setup unless I have to.

The chain itself is fairly new and well looked after.

Thanks for any thoughts.

Kind Regards,

Paul.
 
"Paul" <[email protected]> wrote in message news:[email protected]...
> Well here I go again with, what I guess is, another basic
question but
> people here are great at helping out a beginner.
>
> I've always had a spot of chain rub when riding the middle
chainring with
> the chain on the smallest (8th) sprocket. I realise that
this in one of
> those 'out of bounds' gears and it rarely gets used so
I've never worried
> about it.
>
> I've recently noticed a spot of light chain rub however
when riding with the
> chain on the 2nd from smallest sprocket (7th). This only
occurs when
> pedalling really hard (more of a mash really), the sort of
pedalling force
> that would probably suggest to a more experienced cyclist
that they need to
> change gear :).
>
> I appreciate that both the frame and chain can flex when
pedalling (although
> I have an oversized aluminium alloy frame - I don't know
whether these flex
> or not) but I was wondering whether chain rub is anything
to worry about,
> does it suggest a mal-adjusted derailleur? The chainrings
shift crisply so I
> don't want to meddle with an otherwise working setup
unless I have to.
>
> The chain itself is fairly new and well looked after.
>
> Thanks for any thoughts.
>
> Kind Regards,
>
> Paul.
>
>
Try screwing the front cable adjuster (on the down tube) out a little bit. This should move the FDR
out in the middle ring.....
 
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