I regularly ride both Rs but was puzzled a week ago by a very loud noise coming from the front, of my RD, then also on my RC,…initially thought it was wheel bearings. After investigation coincidentally both speedos had dried out at the same time. These speedos are extremely rare, i dont think ive ever seen one for sale, so message to others to be aware of this small regular maintenance detail….WD40 sprayed into the internals every now and again fixes it completely.
JohnS