Steve, I'm pretty sure an impact caused the bulging as both sides were equally protruding when the rubbing first happened. However, one could argue that the wear on the braking surface caused *greater* damage due to the impact.
-Patrick On Wednesday, February 28, 2018 at 9:47:27 AM UTC-5, stevef wrote: > > Kind of a causality paradox since this crack was most likely caused by > wear of the brake surface. Disc brakes don't cause that sort of wear. > > On Wednesday, February 28, 2018 at 9:33:09 AM UTC-5, Patrick Cronin wrote: >> >> >> After riding a bulging 40-spoke Velocity Dyad rim on my Hunqapillar for >> too long it finally cracked. The only way I knew about the bulge is because >> once per rotation the wheel rubbed *both* brake pads. The wheel was >> never out of true, so I kept riding it ~1000 miles. I decided to rebuild >> the wheel only because I hit a sand/salt patch on the road, skidded about >> ten feet when the rim hit the brake pads and I nearly went down. Most >> notable is that I never flatted, as in not once since this wheel was built >> in 2011. I'm curious if I would have known about the issue had I been >> running disc brakes. That got me thinking more: I wonder if rim brakes are >> safer for this reason. Had I been running discs I likely would have had a >> catastrophic rim failure because, other than cosmetic, there would have >> been no indication of a problem. Thoughts? >> >> >> -Patrick >> >> >> >> >> >> <https://lh3.googleusercontent.com/-7YsTmvCvYnY/Wpay8RfsJeI/AAAAAAAAsrY/azDpm_9nqTgfXd0uBXN694VubKvvY9K9wCLcBGAs/s1600/IMG_0002.jpg> >> >> -- 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 rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
