The upper headset bearing cup is stuck in the frame. What’s the best way to remove it without damaging the frame?"
by kingchowakanda
The upper headset bearing cup is stuck in the frame. What’s the best way to remove it without damaging the frame?"
by kingchowakanda
5 Comments
I’ve used a [headset removal tool](https://www.jensonusa.com/park-tool-rt-1-headset-cup-remover-fits-1-1-18-1-14-headset-cups?loc=usa&gad_source=1&gad_campaignid=18444120634&gclid=EAIaIQobChMIsfjJxOKSjgMV1G5_AB1g1BrcEAQYBCABEgLOXvD_BwE), you just have to be 1000% certain you’re contacting the bearing race and *not* the carbon lip of the frame. Spraying a little rust remover or penetrating fluid first to loosen things up can help.
FOLLOWING
How would you remove it without a headset tool?
Ideally a large blind bearing puller.
But it’s not a common tool to have around, certainly not one that size.
Best way I’ve found is to stick a flat bladed screw driver horizontally under the outer race, then use a punch from the other side to tap it out.
The best way is to take a large blind bearing puller, grind it to fit the race and slide hammer it out. Blind bearing pullers this size are designed around bearings with bigger balls, maybe someone makes one that actually fits a bicycle headset bearings, but general purpose pullers need modification to work
First prepare a puller kit: Find a socket with suitable outer diameter to push from inside the headset tube. Then find a larger socket that bearing cup fits into and and still can hold around the top. Put some vinyl tape in between the upper socket and frame to prevent scratching. Run a bolt through both sockets. Test the fit without applying pressure.
Now shrink the cup with cooling spray (The cheap -50 C stuff works fine) Quickly assembly the puller and apply pressure until the cup is out.