On 7/9/2018 9:05 PM, Jeff Liebermann wrote:
On Mon, 9 Jul 2018 15:26:18 -0400, Frank Krygowski
wrote:
Actually, the OP was talking about drilling and tapping instead of
Rivnuts. And it wasn't clear to me, at least, exactly what portions of
the frame he was interested in tapping. A photo or two might help.

He started out talking about drilling and tapping, but switched in
midstream to Rivnuts. See:
https://groups.google.com/d/msg/rec.bicycles.tech/Cx1f1zC9TsM/uWXvnWNGBQAJ
I keep hearing this, but it isn't the case for
my bikes which have chainguards.

These have three stays, and of those, two are
mounted on the bike frame with M5 screws.
Threaded hole, no nut on the other side!

Then the chainguard is mounted on the stays,
likewise with M5s, threaded holes (only here
sometimes there are nuts as well).

The stays are about 1mm. How thick the frame
tube wall is I don't know, but I can take
a discarded frame and cut it with an angle
grinder to find out, God willing.

This ain't to say that rivnuts ain't a good
idea, of course.

This was the first mention of Rivnuts in the thread (I checked).

Actually, I mentioned Rivnuts when I posted the very first reply to
Emanuel's original post. That was about eight hours before the post you
quoted.

Also note that he indicates that "the chainguard is mounted on the
stays...". Which of the stays, he doesn't mention, but it doesn't
matter. Chain stays and seat stays are both rather small diameter.

The reason I'd like photos is that Emanuel seems to imply that a hole in
the stays is the original method of mounting the chainguard. I think
that's unlikely. I wondered if there are brazed-on tabs or some other
feature that we don't know about.

ISTM that Emanuel isn't very clear on many bike-related terms in
English, and he seems to be a novice mechanic in general. Some of his
descriptions may be unintentionally misleading.


--
- Frank Krygowski