Post your broken Uni parts here..

[RHankey]

Originally Posted by HKiviniemi

Got a pair of new bearings and changed the working one. I have a problem with the broken one though.. Can't pull from the bigger ring because the ring slips off and can't get my bearing puller to hold onto the smaller ring.

Does someone happen to have a suggestion to easily remove the broken bearing?

How about attaching a hose clamp around what is left of the outer bearing race. With the clamp tightened down tightly against the balls, you should then be able to use the bearing puller against what is left of the broken other race. Failing that, you're going to have strip the bearing down so you are left with only the inner race, and pull that off on its own.

[HKiviniemi]

Thanks for advice everyone! Ended up "dremeling" the inner race and that helped to get it off:



I have no idea what caused the crack.. Maybe some dirt had gotten between the bearing and it's holder? If this happens again, I will look more deeply into this. It's only like 3€ for a pair of 6203 bearings though, so I won't bother investigating this now.

[bristlecone]

Originally Posted by HKiviniemi

Thanks for advice everyone! Ended up "dremeling" the inner race and that helped to get it off:



I have no idea what caused the crack.. Maybe some dirt had gotten between the bearing and it's holder? If this happens again, I will look more deeply into this. It's only like 3€ for a pair of 6203 bearings though, so I won't bother investigating this now.

Nicely done.

I had a bearing go on a ride. Unlike you, who are wiser, I had ignored bad sounds for a while. Then in the middle of some muni riding there was a sudden clunk, the wheel went loose and sideways, and a few bearing balls started rolling down the hill. Much better to take a look when it starts making noises!

[chainreactionphysics]

Quick question. How long do bearings last on muni used about, 5 hrs a week. Months or years. Just got a big trip coming up. Might need to take spares.. Thanks

[Piece Maker]

Originally Posted by chainreactionphysics

Quick question. How long do bearings last on muni used about, 5 hrs a week. Months or years. Just got a big trip coming up. Might need to take spares.. Thanks

Slightly curious about this too. My 36er bearings are feeling a tad squeaky, I've had them in there a good 3+ years with very little maintenance...

[Kitibob]

Originally Posted by Piece Maker

Slightly curious about this too. My 36er bearings are feeling a tad squeaky, I've had them in there a good 3+ years with very little maintenance...

I have never changed any bearings, although I don't think i've done the same sort of distance as you. I did once ride my unicycle into the sea for a bit of a laugh, and bought some new bearings beforehand as I knew the outcome. Bearings were immediately crunchy and sometimes stopped turning, but I peeled the seals back and poured some engine oil in, and they've been working ever since... It's been about 2 years. Never did get to use the bearings (although they came in handy for the final drive shaft in the gearbox of my honda C50 when that broke...)

This isn't really broken, and i'll continue to use it regardless, but are anyone elses cranks not at 180 degrees to one another? It's a very old, probably cheap circus unicycle:

[OneTrackMind]

Originally Posted by HKiviniemi

Does someone happen to have a suggestion to easily remove the broken bearing?

Bearing races are extremely hard and as such, they are also brittle. First, thin it using a grinder. Then place it on a hard anvil and hit it with a hammer and chisel to crack it.

[YONO]

I think some Taiwanese sleeping beauty at the bearing housing welding department didn't pay enough attention during the construction of my Impact frame.
That's a bottom bearing holder welded to the left frame leg. So.. with no thread on either side I guess I'll just have to zip-tie the halves together...

I guess I'm not taking my new Impact out for a 360 unispin this weekend...

[Piece Maker]

You could just make like a pressed steel bearing cup and use a nut 'n bolt

That's a pretty weird defect though. I sort of assumed the part where they weld the bearing cups on is a completely seperate part of the process to putting the frame in the box with the bottom cups.

[YONO]

Most likely the mistake already happened at the station where they manufacture the cups. Because the parts are so alike they probably use the same machine for these parts. If they switch dies and they don't completely clear the machine (or the cart/bin they collect they bearing cups in), things like these happen.