Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 35 Post(s)
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Originally Posted by mrrabbit
That's actually pretty common on older rims from the 70s and 80s.
+1, it's par for the course on rims of this vintage. The double eyelet system requires that the inner cup hangs from the upper rim surface in order to transfer load. With the tolerances of the rims of that era, that meant that some of the cups ended up above the lower (hub side) wall of the rim, and therefore the rivet wouldn't be closed to zero clearance.
When the rim is built, the assembly settles inward under spoke load causing what you see. All it means is that the eyelet is doing it's job. OTOH, it caused concern in the market place because it looks wrong (even though it isn't) so most makers started being super diligent about eyelets being fully settled against the hub side wall of the rim, which also means that the inner cup doesn't transfer load to the upper wall as effectively.
Another case of presentation trumping function.
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