Quote:
Originally Posted by GonaSovereign
Yes.
Cervelo S3, the first year model. I enlarged a couple of the existing cable entry holes in the top tube, and the relatively large hole under the bb to stuff in the junction box. It was totally fine for the next 3-4 years of heavy racing and riding. The bike was subsequently broken in a crash, but the holes I made remained perfect.
The big caveats: that frame was designed to have those holes in it, and I merely enlarged them a small percentage. That frame was also very well made by people who know composites, use high quality materials and know where is needs to be in the layup. I can't speak for the manufacturer of your "cheap frame" so YMMV.
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Quoting my own post to add that I did not use a drill; I used a file (and maybe a dremel?) to enlarge the holes.
BTW, here are Cervélo's
instructions.