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Which Noise = Which Repair

Scuffing/
Scrapping
When I'm
Pedaling:
yes
When I'm
Not Pedaling:
no
When I Squeez
The Brake:
n/a
When I'm Not
squeezing the brake:
n/a
Diagnosis:
Your chain is  probably rubbing on the front derailure.
This could be because the derailure needs to be
adjusted. The fix: Derailure adjustment.

Another possibility is that one of the chain rings is bent. The fix: replace that chain ring. In somecases all three chain rings and the crank arm are one unit. (cheaper equipment is sometimes rivited or pressed together rather than bolted.)

Scuffing/
Scrapping
When I'm
Pedaling:
yes
When I'm
Not Pedaling:
yes
When I Squeez
The Brake:
no
When I'm Not
squeezing the brake:
yes
Diagnosis:
One of your brakes may be rubbing against the
rim. This could be because the brake needs to be
adjusted. the fix: Brake adjustment (algin pads, and adjust spring tension.)

However, it is more likely that one of your wheels
is bent. This would cause one spot on the rim to rub
against the brake every time the wheel goes around.
The fix: If a wheel is bent slightly it can be fixed by adjsting the tension on the appropriate spokes. This process is called truing the wheel, and should be done by a shop with a truing stand. If done incorrectly adjusting spoke tension can ruin the wheel. 

note* if you have disc brakes a bent wheel would not cause this noise. your brake needs to be adjusted.

Sqealing When I'm
Pedaling:no
When I'm
Not Pedaling:
no
When I Squeez
The Brake:
yes
When I'm Not
squeezing the brake:
no
If your brake pads are not adjusted properly they can
emit a squealing sound when applied. The fix: An adjustment of the brake pads will fix this. Sometimes just cleaning the rim will also fix this problem. 
Creaking When I'm
Pedaling:
yes
When I'm
Not Pedaling:
no
When I Squeez
The Brake:
n/a
When I'm Not
squeezing the brake:
n/a
Diagnosis:
Sometimes a Bottom Bracket (the bearings in the crank) can creak a little when weight is applied to them. This is more common in older bikes than brand new ones. this is caused by the threads in the Bottom
Bracket moving very slightly against the threads in the frame.  The sound itself is not indiciative of a
problem, but it can be irritating. The fix:To eliminate the sound remove the bottom bracket, clean the
threads in the bottom bracket, and the frame, apply
some bearing grease to the threads, and reinstall the
bottom bracket. 
Crunching/
Grinding
When I'm
Pedaling:
yes
When I'm
Not Pedaling:
no
When I Squeez
The Brake:
n/a
When I'm Not
squeezing the brake:
n/a
Diagnosis:
If the bearings in the Bottom Bracket, or pedals are
worn out or damaged they may cause this sound. The
fix: replace which ever bearsing are worn out.

Note* Most pedals are rebuildable, but usually in this case the whole pedal is replaced, as most people find it to difficult, or time consuming to disassemble, and reassemble the bearings in the pedal. 

shifting/
clicking
When I'm
Pedaling:
yes
When I'm
Not Pedaling:
no
When I Squeez
The Brake:
n/a
When I'm Not
squeezing the brake:
n/a
Diagnosis:
If the bike sounds like it is trying to change gears when
you are not trying to, your rear derailure is probably
out of adjustment. This will cause it to try to change
gears on its own. The Fix: Shift adjusment

Another possibility is that your derailure hanger is
bent. the derailure hanger is the little silver tab that
connects the rear derailure to the frame. it is made
of aluminum (which is a soft metal) so that if
something impacts the derailure the hanger will
bend before the the derailure is damaged. The fix:
A slightly bent hanger can be realigned by a shop with a hanger alighment tool. If it is severly bent it will need to be replaced.

1 Comment

Love it! Informative! Things you should find in most bike sites but don’t!

Posted by Wayne Hui on October 27, 2010

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