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If they are 700c (622) I wonder if you could use a 27" (630 or 635) rim that would fit snugly on the outside, and use the holes from that as a guide for the drill (drill press/pillar drill would be most accurate, but the "guide hole" should keep a hand-held drill fairly straight). 27" rims probably tend to have higher spoke counts though, so you might not be able to get the spoke count you want. If you haven't worked with it much, aluminium can be quite grabby with some drill bits, which sometimes affects the finish on the exit.
jdmitch
Is anyone experienced in drilling holes in aero alu rims?
I found some nice Saavedra tub rims going super cheap but the thing is they haven't been drilled. I did a bit of research and it doesn't seem like that much of a hassle. Does anyone know what the easiest way to find out the spoke hole distance would be and how I would possibly go about drilling the holes without too much hassle?
I would image a centre punch then dremel the first holes and then a drill press for the outside?
If anyone wants to chip for some let me know!