During regular Winter time off-season maintenance I noticed that one of the
rims on one of my bikes showed a shallow but nonetheless significant score
mark around the entire braking area surface. Upon closer inspection of the
brake pads I found a small rock stuck in one of the pad grooves (the ones
that are supposedly there to expel water from the rim while braking when
wet) that caused the damage. The front rim on this bike was replaced in
2004 after having been taco'd in a crash, but the rear dates back to the
late 90's. The front shows lesser wear. Both rims are venerable Mavic
So, I'm wondering two things: 1) what is the normal life expectancy of
aluminum rims, and 2) why brake pad manufacturers insist on installing
those grooves when everything I've read about them says that they do little
or no good for anything. In the case of the first issue, there is no good
way to measure rim wear unless the manf. has installed dimples or holes or
grooves on the braking surfaces that act as wear indicators. A caliper
won't do any good because the "tire hook" prevents the caliper from seating
properly against the inside of the rim. In the case of the second issue,
are there solid pads available that do not have these slots in them,
therefore minimizing the chance of a rock getting caught?
I never had rim wear problems until I moved to an area where I had to do
most of my riding on trails constructed from compacted limestone
screenings. Before that all my riding was on hard surfaced roads.
You received this message because you are subscribed to the Google Groups "RBW
Owners Bunch" group.
To unsubscribe from this group and stop receiving emails from it, send an email
To post to this group, send email to email@example.com.
Visit this group at https://groups.google.com/group/rbw-owners-bunch.
For more options, visit https://groups.google.com/d/optout.