Home canti stud repair

[hamster]

I thought I'd share a canti stud repair I made over the weekend. Repair kits are available (typically the Problem Solvers kit) but were going to struggle with the problem on my frame (a very nice 653 Dawes Edge I bought off Gaddmeister with the problem stud). A canti bolt had seized in the frame, and subsequent attempts to drill it out appeared to have failed. I bought the frame with a mangled stud. The problem was worsened by the boss being very close to the seatstay and a bolt could not be fitted through from the back.

Firstly the stud was sawn off the boss and the remains of the old canti bolt removed.

The stud would be replaced by one from a scrapped frame (in this case a Univega Alu-800 which had cracked).

The threaded bottom of the stud was removed to leave just the part for the canti and a tiny bit to allow a spanner to grip.

The boss was cleaned up and tapped with the correct M6 thread. A stainless M6 bolt was then driven through and into an M6 stainless Nyloc on the other side. Note the extra nut, more later!

The bolt was then withdrawn, with threadlock on it, back until tight.

The head of the bolt was then sawn off giving 8 threads for the stud to screw onto. Removing the nut cleaned the threads up allowing the stud to fit neatly.

The stud was tightened onto the thread, and secured with a little thread lock.

Ride and enjoy!

 

[retrobate]

Re:

I have done the same repair but the stud had snapped off due to a lashed up disc adaptor.

I vee'd out the break line, reinforced it with a cut off bolt, welded it together and dressed the weld back. Still going 10 years later.

 

[Woz]

Bumping this now that I've found it again - I remember when it was posted and thought it was very clever.

Took some inspiration from it via a flash back to help with a slightly different problem:
https://www.retrobike.co.uk/threads/🍷-bikewrenchers-inn-🍺.447640/post-3616531

 

[OrangeFox]

Reviving this thread to ask Hamster if this repair is still holding up? Looking at doing this to a set of forks myself... Cheers!

 

[OrangeFox]

Reviving this thread to ask Hamster if this repair is still holding up? Looking at doing this to a set of forks myself... Cheers!

I will add though, the bolt i use wont go all the way through the stud as it is narrower at the end causing it to stop only a few threads in. Thinking ill give it a go though

 

[hamster]

You only need 5 threads for full strength - that's what you have with a nut. You could also run a tap down it to extend them, which is what I did. I used 8 because I could! If you are really worried, fit a brake booster to avoid a twisting force on the stud.

The bike is still going strong 5 years on including heavily laden tours in Scotland and France, bikepacking on Dartmoor and loads of general riding.

 

[OrangeFox]

That makes sense and adds some relief! I'll inspect closer to see if i can tap some more threads in, I worry that it might need predrilling which i assume wont be possible as to ruin the existing threads.
good to hear the bikes still going strong as well. Cheers!