So I had a weird feeling about my brakes while riding a week ago so I disassembled it and turned out, my threads were completely ripped.
I knew they wasn't complete and seen a few brakes, reassembles already so it didn't surprised me at all.
So I drilled up the holes to 6,80mm and cut a M8x1.00 thread in it wich is important bc the standard thread pitch is 1.25 and it can't hold strong enough. Made a few galvanised stainless steel M8x1.00-M6x1.00 adapters for it, glued them in with threadlock and… done ✅
it's working and has enough wall thickness as well so it's strong enough.
by RSH_Pedroo
11 Comments
You could have just used a helicoil and you wouldn’t have had to remove as much material.
The wall thickness isn’t designed for a hole that big. Should have used a helicoil or timesert.
That fix will take you all the way to the scene of the accident.
dang, making your own thread adapters is next level diy. honestly sounds like a skill i’d be too scared to try but props to you for making it work!
If that’s a 2019 Pike, I had the same issue. Bought the helicoil kit and everything but never got around to it. I just removed a spacer from my M6 bolt and threw some orange lock tite on there. It grabbed the deeper threads that weren’t mangled. It held up at the bike park just fine. I have since upgraded my fork and the peace of mind is great haha
There’s a reason Helicoils exist.
I’ve worked on a TON of bikes and never managed to (or have ever seen anyone) do this to their fork
There is no galvanized stainless steel. It’s either galvanized steel or stainless steel. You can technically galvanized some stainless steel alloys, but is useless.
Timesert fittings are the only reliable way to repair post mounts on a fork.
PSA: do not do this (at least not this specific way as it will fail eventually)
Ignore all the keyboard mechanics. This is a solid repair. Tbh I would have used a off the shelf keensert but homemade approach is just fine. The break mounting bolts will see more tention and compression loads.
Nice fix! This will do plenty fine. My calcs show the M8x1.25 actually does hold well enough and i’ve used these plenty as they’re way more common than the 1.0.
Check your tap drill size for the M8x1.0 if you continue to use those 😉 but i guess drilling by hand probably has a 0.2mm slop in it anyways.