One thing that I do not really like about my Deltas is that they have a tendency to collect a lot of road dirt and grit inside their casings. I still remember how long it took for me to flush out all the crap in it when I was cleaning it after I just acquired the brakeset. Modolo (Kronos) and Weinmann (Delta Pro) had a good idea of providing a full rubber cover on their Deltas, that mostly sealed them from road detritus and moisture....