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 Open Pro's.
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 rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to firstname.lastname@example.org. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.