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So I have a bike without pegs for the mounting of a cargo bike rack.

It is a steel frame so I was thinking of installing make-shift pegs myself.

Is this going to breach the integrity of the frame?

I know some types of metals and constructions aren't intended to be drilled through.

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  • It really depends where and how large the hole is. It might help if you posted a photo of the area and told us the size of the hole. But even then it’s hard for anonymous internet commentators to give a definitive answer and it might be best for you to ask the manufacturer (who will, for liability reasons, most likely say that it’s a bad idea).
    – RoboKaren
    Commented May 9, 2018 at 14:18
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    There are various clamp-on arrangements you can use, from simple P clips to specially designed racks. Would any of those work?
    – Chris H
    Commented May 9, 2018 at 15:21
  • You might be OK, but you might not. Try some clamp-based scheme first.
    – Daniel R Hicks
    Commented May 10, 2018 at 0:47
  • If clamps do not work, a brase on bracket would be better than drilling.
    – mattnz
    Commented May 10, 2018 at 4:49

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It mostly depends on the thickness of the tube.

Chainstays and seat stays tend to be quite small tube, so drilling them takes a larger percentage of metal away. I would not drill a stay unless I had a welder to add metal- instead I'd use a clamp-on fitting.

For downtubes and seat tubes, the tube itself tends to be wider. I've successfully used a nutsert or rivnut to add bidon mounts to a steel road bike. This involved careful drilling, then using a special tool to mount and crimp a special insert into the frame.

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