Repairing a bottle cage

[Jameshow]

My son has bust a bottle cage nut and is spinning in the frame?

Anyone found a way of dealing with this?

I was thinking of punching it out and replacing with a bigger rivnut as he's mounting a electric bike battery?

 

[numbnuts]

Have a look on youtube "bottle cage nut"

 

[Mr Celine]

Either buy a rivnut tool or make one like this.

Using this to tighten the existing rivnut will either work or break the rivnut. If it breaks have fun retrieving it from inside the frame.
New ones are cheap on the Bay of E.

Screw the nut half way down the bolt. Put the end of the bolt through the hole in the steel strip. Screw the bolt a few turns into the rivnut. Use the steel strip to push down hard on the top of the rivnut to stop it turning while you screw the nut down the bolt with a spanner, which pulls the back of the rivnut against the inside of the frame.

 

[Jameshow]

Either buy a rivnut tool or make one like this.


View attachment 752448

Using this to tighten the existing rivnut will either work or break the rivnut. If it breaks have fun retrieving it from inside the frame.
New ones are cheap on the Bay of E.

Screw the nut half way down the bolt. Put the end of the bolt through the hole in the steel strip. Screw the bolt a few turns into the rivnut. Use the steel strip to push down hard on the top of the rivnut to stop it turning while you screw the nut down the bolt with a spanner, which pulls the back of the rivnut against the inside of the frame.

Problem is there a seized bolt in the rivnut?!

Perhaps drill it out and replace with a bigger rivnut as it's for a electric bike.
Worst / best case is to weld into frame a new bracket for the battery....

 

[scragend]

What I did recently to remove my spinning cage bolts was to grind off the head of the bolt with a Dremel and then grind down the outer lip of the rivnuts till it gets so thin you can break it (or it breaks itself). Then the whole thing drops through the hole into the frame.

Getting it out after that is easy. Remove the bottom bracket and it will fall out.

Put some tape all round the rivnut before you start to protect the frame.

 

[Jameshow]

We took it to my men's shed and they sorted it.
He's put another strap higher up too as the battery is quite heavy.

 

[Ajax Bay]

As I suspect you realise, the bottle cage fastening braze ons are designed to support a max 1kg load, CoG above the lower support (if one litre bottle on seat tube).
Hang a battery on it and be prepared for its failure.

 

[Jameshow]

As I suspect you realise, the bottle cage fastening braze ons are designed to support a max 1kg load, CoG above the lower support (if one litre bottle on seat tube).
Hang a battery on it and be prepared for its failure.

I agree is a fudge of a design tbh. The whole setup is shoot as he's found out, he's since bust the freewheel of the basic giant mountain bike that the whole conversion is mounted on...