I recently built up a set of cxp 33's and it went pretty well, however, inside the spoke holes, in between the inner and outer web is a metal tube kind of thing. I cant figure out what its purpose is. anyone know?
AEO
10-02-08 11:23 PM
so the nipples can't fall into the rim?
ls01
10-03-08 12:16 AM
wow, I hope thats not all there for. I would have pulled them out if I had known that thats all they are there for. kind of a lot to go through, weight wise, for that.
It's a collapsible eyelet design. It's there so the nipples won't pull through the rim when there is a lot of tension on the spokes. It's there the give the nipple some bite and create a surface for the nipple to sit on. Without it, the nipple would just sit on the inner rim surface and, over time, either crack the rim or pull through.
waterrockets
10-03-08 06:57 AM
Originally Posted by damocles1
(Post 7595612)
The real answer you say...?
It's a collapsible eyelet design. It's there so the nipples won't pull through the rim when there is a lot of tension on the spokes. It's there the give the nipple some bite and create a surface for the nipple to sit on. Without it, the nipple would just sit on the inner rim surface and, over time, either crack the rim or pull through.
Yep, that's what it's they're for, but I've seen plenty of eyeletted rims crack at the spoke holes, so it's not a cure-all if there's too much tension. Often, the eyelets don't have any weight cost at all, because the area around the spoke holes doesn't have to be built up as much as those without eyelets (compare Open Pro weight to Aerohead, for instance).
One thing you can do with a non-eyelet rim to correct for this is to gently twist a phillips screwdriver tip inside the spoke hole, from outside the rim. This will de-burr the drilling, and burnish a slight bevel into the edge of the spoke hole. This makes a more regular mating surface for the nipple flange.
