I had bought my Miyata 710 out in Phoenix, where it is sand that is the issue. Sand gets into the brake pads and wears out a rim in short order. The Miyata's original rims had deep grooves worn into the braking surface that developed into cracks. I was wondering where the brake pulsing came from - rims straight and true, but then I noticed that the rim had a slight bulging out in a few places when the tires were inflated to 95psi - where the cracks in the rim were - and the bead pressure was pushing it outwards.







Now the Miyata rides on a new set of black Mavic Open Pro rims, laced to DuraAce hubs with 15/16ga spokes.