fixing rollers

Quoted message said:

I bought some used minoura action mag rollers, and love them, but
the rear drums are making a rhythmic thumping noise when I ride on the
right half.

I've re-tightened all the bolts (didn't help), loosened them (noise got
louder), made sure the plastic end caps are tight (they are), and tried
taking off the pulleys (no change). I'm now thinking I may have to
take the drum(s) apart to fix it, or else stay on the left side of the
rollers until they die completely and then replace them.

Questions:
1. What's causing the noise?
2. How do I fix it?
3. If I do have to get into the drum, does anyone have a pointer to
some instructions/diagrams/advice?

See if there is any bearing play. Those are easily and
cheaply changed.
More likely, you have a dent in a drum. Turn the drum by
hand and feel the surface with your other fingers. Dents can
be worked out as, any metal piece. If you can't manage that,
a new undented drum is $50 with bearings, caps and shaft.

If your drums are loose in the caps, use a contact cement
such as tubular rim glue instead of something rigid like
super glue. Later access is quick with a heat gun.

--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

Thanks Andrew -

I couldn't find a dent or loose caps. However, while I was checking
for bearing play, I noticed that there's a spot in the rotation of the
drum where it seems to turn less easily, so I'm leaning towards
thinking there's a problem with the bearings as you suggested.

I'm glad to hear bearings are easily and cheaply changed. I'd like to
do the work myself, but haven't been able to find any documentation on
how to get to the bearings. Do you have any pointers?

jodi said:

I couldn't find a dent or loose caps. However, while I was checking
for bearing play, I noticed that there's a spot in the rotation of the
drum where it seems to turn less easily, so I'm leaning towards
thinking there's a problem with the bearings as you suggested.

I'm glad to hear bearings are easily and cheaply changed. I'd like to
do the work myself, but haven't been able to find any documentation on
how to get to the bearings. Do you have any pointers?

Sure, just tap out the shaft and then the bearing. It isn't
a difficult fit, no special tools needed. Note that at least
one cap has to be loose to start that process. A hair dryer
helps. That basic design covers most popular brands of
roller BTW.

Your bearing has a number stamped on it, ISTR 6200?? Since
they are used indoors, any letter suffix ( seal type) will
do. Any bearing house will have that series.

That sort of bearing cartridge is often sold with just
enough oil to prevent rust in shipping. Carefully lift a
seal on one side and press grease through it before
installation. Fill the space.

If it binds at one spot I'd look to see if something isn't
just rubbing on the edge of a cap. And ensure the shaft is
not bent.

--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

Thanks again Andrew - I'll give that a shot.

-Jodi

I had same problem some 2 years ago and found out that the cause of the
rhythmic thumping from a pitted cone in the front wheel. Not noticable
on road but only on the minoura roller. Changed the cone and OK till
now.

This is in case you didn't see any problems from the roller.
Regards,
KW Mui