Originally Posted by
Duragrouch
I have never seen any double-socket/eyelet rim crack at the spoke hole. They are incredibly resistant to metal fatigue, which is the only reason they add all that weight out at the rim with those additional steel thimbles, so each spoke pulls on both inner and outer walls. If there was a version that was only simple standard rivets, sure, they eventually crack like other rims.
Dark/hard-anodized rims have a tendency to crack at the eyelet, whether it's single or double. Jobst Brandt detested hard-anodized rims. From
this page:
"
Dark anodized rims were introduced a few years ago as a fashionable alternative to shiny metal finish, possibly as a response to non metallic composites. Some of these rims were touted as HARD anodized, implying greater strength. Hard anodizing of aluminum, in contrast to cosmetic anodizing, produces a porous ceramic oxide that forms in the surface of the metal, as much as 1/1000 inch thick, about half below the original surface and half above. It is not thick enough to affect the strength of the rim, but because it is so rigid, it acts like a thin coat of paint on a rubber band. The paint will crack as the rubber stretches before any load is carried by the rubber. Similarly, anodizing cracks before the aluminum carries any significant load."
Photo shows what looks to me like a double eyelet.
