Knocking noises and feelings through the pedals, in order of
likelihood:
Cranks loose. Sometimes this is detectable when riding, but not when
you get off the uni and try to wiggle the crank. Strange but true.
Buy a crank extractor - it is something you will use regularly, and is
worth the small investment. Remove the cranks, clean the mating
surfaces, then refit the crank carefully, using a 14 mm socket. Ride
for a few minutes, then tighten again.
I have never used or needed thread lock glues and that type of stuff.
Next choice: bearing clamps. Even a slight looseness can translate
into a rhythmic knocking in time with your pedalling. Tip the uni
upside down, and nip the nuts up a bit tighter wth a 10 mm spanner.
Don't overdo it. Make sure that the gaps between the clamps are even
(i.e. the clamps are parallel).
Loose pedal. Nip up with a 15 mm spanner. remember that the left side
pedal has a left handed thread. Tighten it the opposite way to almost
any other thread you have ever tightened.
Pedal bearings - there's always a bit of play. Too much can be a
nuisance. Some pedals are adjustable, some aren't.
You certainly need to identify the problem as soon as possible. The
noise is something loose, moving and contacting something else. It
will cause wear.
--
Mikefule
"The world is Hell, and men are on the one hand the tormented souls, and
on the other the devils in it."
Arthur "Cheery" Schopenhauer
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