After more than 20 years, my front rims finally derformed. The contact surface against the brake pads become too thin that they suddenly warped like burning plastic. I was surprised while I was riding from work, that I felt my pads aren’t making full contact. Than the rims made a thud-thud-smooth-thud-thud sound. I stopped and saw that this was the result of years and years of brake rubber versus aluminum.
Oh well, luckily my wife’s bike isn’t being used regularly so I exchanged it with her front rims. Sheesh…Need to save so that I could buy my replacements.