First, thanks to all who have shared their experience, observations and
advice.
Here are the brake pads:
http://www.flickr.com/photos/carner/4892840374/
http://www.flickr.com/photos/carner/4892244553/
I removed the tire and rim tape and closely inspected the rim. I saw no
signs of even tiny cracks, inside or out. I put the rim on my very
basic Minoura Workman Pro truing stand. Best I can tell the rim is
true to less than a mm. radially and laterally. I could not detect any
irregularities of the braking surface. Specifically, I could not find
any area where the rim was "fatter" than it should be.The scoring was
bad enough that I used a maroon abrasive pad to smooth off the worst
high spots, replaced tire, remounted with the same pads (after cleaning)
and today got in a short test ride. The braking is very smooth, too
smooth in fact. Even the original little "tick" is gone, but there is
some loss of stopping power, I assume from my sanding. I plan to do the
burnishing thing before replacing the tire, although I am a little vague
on exactly how that is done. "Instructables" has instructions on using
a home made stone made out of slate for burnishing anodized rims, but I
don't have any slate available.
As I mentioned in the original post, I have had several rides lately on
mostly gravel roads. On one of those, the roads were wet. The damage
was apparently done by getting sand and small stones stuck in the pads.
I guess I do need to be more careful about cleaning the pads after a
ride in those conditions. Also, have been planning to get the Yokozuna
cartridge shoes and pads from RBW. The last time I placed an order they
were out of stock, but I see they are back. Does anyone have experience
with these or have another recommendation? From looking at the pictures
they have the cross grooves similar to the Shimano pads.
I am also trying to decide if all this trouble is a definite sign that I
should replace the front V-brake with a Paul Neo-Retro :-) .
David
EricP wrote:
Will agree with Tim, that the o/p should check his brake pads.
However, will also agree with David Craig and suggest the person also
pull the tire, tube and rim strip and make sure there are no cracks in
the rim with that wear. Had two Velocity rims crack internally, so am
more paranoid about them
However, as that seems to be all the way around the rim, would think
it's more an issue of the pads.
Eric Platt
St. Paul, MN
On Aug 14, 11:14 am, Tim McNamara <tim...@bitstream.net> wrote:
On Aug 14, 2010, at 6:00 AM, Angus wrote:
I have had rims, in the past, wear unevenly next to the spokes.
Yes, this should be clarified. The spoke tension causes a tiny
amount of bulging in the rim wall by each spoke which is why it wears
more there. This tends to be evident only on rims with anodized
sidewalls and/or where the brake pads are especially abrasive for
some reason. Back in the bad old days of dark "hard" anodized rims
there was a spate of really ugly wheels out there. This was solved
by machining down the sidewalls, which not only improved the
aesthetics but also improved braking; anodizing is a bad brake
surface for several reasons.
In the photos, the scoring looks unusually bad for a rim with this
few miles on it. That's why I suggested looking at the braking
surface of the pads to see what's stuck in there. Some pad materials
are more prone than others to picking up flecks of aluminum from the
rim which becomes a nice abrasive. Or pads with gaps and voids in
them can pick up small pieces of rock, etc. I have found that some
Shimano pad materials seem especially abrasive.
--
You received this message because you are subscribed to the Google Groups "RBW
Owners Bunch" group.
To post to this group, send email to rbw-owners-bu...@googlegroups.com.
To unsubscribe from this group, send email to
rbw-owners-bunch+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/rbw-owners-bunch?hl=en.
