I got this bike (aluminium)and there is this hole for the bottle cage holder and the previous owner told me the bottle cage screw seized with the bolt of it in the frame and he drilled them out and in doing so he drilled the frame, you can see the whole is not round. Hlw can i fix this in a way that lets me put a screw again. Be it welding or qnother way
by Aggressive-Round-533
11 Comments
[deleted]
Depending on how large, if you just replace the Rivet it may hold fine and dont have to do anything extra.
You could hit it with some epoxy before Pressung the rivnut and have it be fine (assuming it covers the open area)
I’d install a larger rivet since I have a set. One bolt will be larger than the other, oh well. You can just epoxy a rivet in and it should hold if you don’t go crazy torquing the bottle cage.
Because the hole isn’t round it would be awkward to re-drill. I’d open it up with a bore (dremel) then either use a self tapping thread or a riveted thread. Job done.
Don’t epoxy, but go for a larger M6 rivet nut and set it with a rivet nut gun. Most bottle cages support an M6 screw or can be slightly enlarged, so i’d go for M6 if this was an M5 nut previously. If that is not enough, go for m8 and use a thread reducing insert to M6 or M5.
There are different shapes of rivnuts:
Head:
* countersunk
* flat head
* wide (flat) head
Rivet section:
* plain round
* serrated round
* hexagonal
Wide head + hexagonal shaped are the strongest ones. You will need to file the hexagon shape into the hole though using keyhole files. It is a simple and easy job and i have added luggage mounting threads to several forks already using this method (none has failed so far).
I’d go for a steel zinc yellow plated hexagonal rivet nut in M6 or M8 depending on your hole size. Aluminium rivnuts are also okay, but weaker and often not available in hex shape.
– Why not stainless steel? – In an Aluminium frame that would create a galvanic cell, corrode the frame and eventually make the hole even larger.
People keep saying rivet, but if you look up rivnut or rivet nuts, you’ll find what you need to install into that hole. A round file may help clean up the edges.
[Rivnut](https://youtube.com/shorts/R6qaLgSkycc?si=SXFIBrL9chgRiFW_).
There are special tools to install, or [hardware store DIY](https://youtube.com/shorts/nUsJ5BkQCDA?si=B7UDX45FYLlcobVD) solutions.
https://www.harborfreight.com/45-piece-threaded-insert-riveter-kit-1210.html
The insert came out. Should be able to install another, mabey glue it in.
As long as there are no cracks it should be safe. Just put a larger rivet and voila you can now put a cage for your precious h20
Go get jb weld and a rivnut and jb weld it in place. It will be super strong and impossible to pull out by hand. Jb stick weld is even better yet for this application because it’s more like a clay than a thick liquid.
Electrical tape.